Thank you for pointing out the typo in post # 117. In the October 1966 general election the Liberals won 24 seats, not 22.Apart from the typo - the GE was October 1966 - all plausible. A Conservative recovery but not enough to break through the Labour majority built up in 1961.
If not already asked, I presume the World Cup occurred as in OTL and of course Aberfan occurred in OTL on October 21st 1966 so you'd see Callaghan and the Queen going to the village (perhaps).
The Smethwick contest in OTL was infamous, as you say. Griffiths went on to become Conservative MP for Portsmouth North as I recall defeating Frank Judd in 1979 and holding the seat until defeated in the 1997 Labour landslide.
Compared with the 1966 OTL election, the Liberals in ATL are getting a lot more votes (19.4% compared with 8.5% in OTL) and seats (24 here compared with 12 in OTL).
The 1966 World Cup happened as in OTL, and England won the final. Also the Aberfan disaater on 21 October 1966, and the Queen and Callaghan went to the village.