Note: The figure of 61 is based on the assumption that there was OTL 50 ready Spitfires plus additional production minus the 12 aircraft required for conversion of Defiant Squadrons to Spitfires. 50+10+13-12 = 61 Spitfires available for issue to the Squadrons.
RAF Fighter Command Order of Battle, 1st July 1940 (From Appendix II, The Most Dangerous Enemy)
11 Group
Sector A Tangmere 43 Squadron – Tangmere, 13 Hurricanes, 18 Pilots
145 Squadron – Tangmere, 11 Hurricanes, 17 Pilots
601 Squadron – Tangmere, 15 Hurricanes, 19 Pilots
FIU – Tangmere, 4 Blenheims, 10 Pilots
Sector B Kenley 64 Squadron – Kenley, 10 Spitfires, 19 Pilots
615 Squadron – Kenley, 12 Hurricanes, 21 Pilots
111 Squadron – Croydon, 12 Hurricanes, 17 Pilots
501 Squadron – Croydon, 10 Hurricanes, 18 Pilots
Sector C Biggin Hill 32 Sqaudron – Biggin Hill, 12 Hurricanes, 16 Pilots
79 Squadron – Biggin Hill, 12 Hurricanes, 14 Pilots
245 Squadron – Hawkinge, 15 Hurricanes, 16 Pilots
610 Squadron – Gravesend, 14 Spitfires, 20 Pilots
600 Squadron – Manston, 8 Blenheims, 22 Pilots
Sector D Hornchurch 65 Squadron – Hornchurch, 11 Spitfires, 16 Pilots
74 Squadron – Hornchurch, 10 Spitfires, 20 Pilots
54 Squadron – Rochford, 12 Spitfires, 18 Pilots
Sector E North Weald 56 Squadron – North Weald, 16 Hurricanes, 20 Pilots
151 Squadron – North Weald, 14 Hurricanes, 20 Pilots
85 Squadron – Martlesham, 15 Hurricanes, 21 Pilots
25 Squadron – Martlesham, 6 Blenheims, 22 Pilots
Sector F Debden 17 Squadron – Debden, 14 Hurricanes, 19 Pilots
Sector W Filton 92 Squadron – Pembrey, 11 Spitfires, 19 Pilots
213 Squadron – 14 Hurricanes, 20 Pilots
234 Squadron – 9 Spitfires, 21 Pilots
Sector Y Middle Wallop 238 Squadron – Middle Wallop, 10 Hurricanes, 17 Pilots
236 Squadron – Middle Wallop, 11 Blenheims, 19 Pilots
Sector Z Northolt 1 Squadron – Northolt, 10 Hurricanes, 18 Pilots
609 Squadron – Northolt, 15 Spitfires, 18 Pilots
604 Squadron – Northolt, 10 Blenheims, 21 Pilots
257 Squadron – Hendon, 13 Hurricanes, 17 Pilots
Note: Hurricane Strength To be replaced = 163 in 13 Squadrons or 12.5 per Squadron (Considering each squadron should have 16 aircraft at full strength that gives a 28% Serviceability rate)
12 Group
Sector G Duxford 19 Squadron – Fowlmere, 9 Spitfires, 25 Pilots
Sector J Coltishall 242 Squadron – Coltishall, 11 Hurricanes, 25 Pilots
66 Squadron – Coltishall, 12 Spitfires, 26 Pilots
Sector K Wittering 229 Squadron – Wittering, 14 Hurricanes, 20 Pilots
266 Squadron – Wittering, 8 Spitfires, 21 Pilots
23 Squadron – Colly Weston, 10 Blenheims, 20 Pilots
Sector L Digby 46 Squadron – Digby, 15 Hurricanes, 17 Pilots
611 Squadron – Digby, 3 Spitfires, 21 Pilots
29 Squadron – Digby, 10 Blenheims, 15 Pilots
Sector M Kirton 222 Squadron – Kirton, 14 Spitfires, 16 Pilots
264 Squadron – Kirton, 12 Defiants, 21 Pilots (Changed to Spitfires, 6 on strength)
Church Fenton 73 Squadron – Church Fenton, 8 Hurricanes, 22 Pilots
87 Squadron – Church Fenton, 14 Hurricanes, 23 Pilots
616 Squadron – Church Fenton, 11 Spitfires, 19 Pilots
249 Squadron – Leconfield, 10 Hurricanes, 23 Pilots
13 Group
Catterick 41 Squadron – Catterick, 11 Spitfires, 21 Pilots
219 Squadron – Catterick, 10 Blenheims, 19 Pilots
Usworth 607 Squadron – Usworth, 10 Hurricanes, 17 Pilots
72 Squadron – Acklington, 12 Spitfires, 19 Pilots
152 Squadron – Acklington, 8 Spitfires, 25 Pilots
Turnhouse 253 Squadron – Turnhouse, 13 Hurricanes, 19 Pilots
603 Squadron – Turnhouse, 10 Spitfires, 19 Pilots
141 Squadron – Turnhouse, 14 Defiants, 20 Pilots (Changed to Spitfires, 6 on strength)
605 Squadron – Drem, 8 Hurricanes, 17 Pilots
602 Squadron – Drem, 10 Spitfires, 23 Pilots
Dyce 263 Squadron – Grangemouth, 3 Hurricanes, 7 Pilots
Wick 3 Squadron – 12 Hurricanes, 18 Pilots
504 Squadron – 12 Hurricanes, 15 Pilots
Note: From 1st July to 9th July a total of 18 Spitfires were lost and required replacement, 12 as per OTL plus 6 as a result of the swap (8 Hurricanes lost in 11 Group = 6 Spitfires).In addition 8 Spitfires were allocated to 264 and 141 Squadrons.
By the morning of 10th July 11 Groups Order of Battle is as follows; the strengthening of squadrons to bring them to a similar level of readiness to those replaced in 11 Group required the issue of a further 35 aircraft.
By the 10th July ready replacements of Spitfire aircraft had risen to 66.
Sector A Tangmere FIU – Tangmere , 4 Blenheims
72 Squadron – Tangmere, 12 Spitfires; Moved from Acklington on 2nd July to replace 145 Squadron
602 Squadron – Tangmere, 13 Spitfires; Move from Drem on 4th July to replace 43 Squadron
152 Squadron – Tangmere, 12 Spitfires; Moved from Acklington on 7th July to replace 601 Squadron
Sector B Kenley 222 Squadron – Croydon, 14 Spitfires; Moved from Kirton on 1st July to replace 501 Squadron
616 Squadron – Croydon, 13 Spitfires; Moved from Church Fenton on 3rd July to replace 111 Squadron
92 Squadron – Kenley, 13 Spitfires; Moved from Pembrey on 2nd July to replace 615 Squadron
64 Squadron – Kenley, 10 Spitfires
Sector C Biggin Hill 41 Squadron – Biggin Hill, 13 Spitfires; Moved from Catterick on 3rd July to replace 32 Squadron
610 Squadron – Biggin Hill, 14 Spitfires; Moved from Gravesend to Biggin Hill on 2nd July
604 Squadron – Gravesend, 10 Blenheims; Moved from Northolt to Gravesend on 4th July
611 Squadron – Hawkinge, 12 Spitfires; Moved from Digby on 8th July to replace 245 Squadron
603 Squadron – Hawkinge, 13 Spitfires; Moved from Turnhouse on 4th July to replace 79 Squadron, moved directly to Hawkinge rather than Biggin Hill
600 Squadron – Manston, 8 Blenheims
Sector D Hornchurch 65 Squadron – Hornchurch, 11 Spitfires
74 Squadron – Hornchurch, 10 Spitfires
54 Squadron – Rochford, 12 Spitfires
Sector E North Weald 25 Squadron – Martlesham, 6 Blenheims
85 Squadron – Martlesham, 15 Hurricanes
19 Squadron – North Weald, 12 Spitfires; Moved from Fowlmere on 5th July to replace 151 Squadron
56 Squadron – North Weald, 16 Hurricanes
Sector F Debden 266 Squadron – Debden, 12 Spitfires; Moved from Wittering on 6th July to replace 17 Squadron
Sector Z Northolt 234 Squadron – Northolt, 12 Spitfires; Moved from St Eval on 5th July to replace 257 Squadron, moved directly to Northolt rather than Hendon
66 Squadron – Northolt, 12 Spitfires; Moved from Coltishall on 1st July to replace 1 Squadron
609 Squadron – Northolt, 15 Spitfires
Thorney Island 236 Squadron – Thorney Island, 11 Blenheims; Moved from Middle Wallop on 4th July