Weren't the mid-1942 plans made in case a Russian collapse looked imminent and only for use in such an emergency?
There were multiple plans prepared from 1941 through the end of 1943. Several of those plans had variations for use were the USSR to collapse. The plan I refered to was for establishing a lodgement on the Cotientin without any specific refrence to what happened in the east. That & the others were effectively shelved when Alan Brooke became CIGS in mid 1942. tho some residual staff work continued until the end of the year. There was a lot of discussion at the high level confrences & proposals included in the memos and minutes from those confrences, but until COSSAC was established in 1943 actual 'planning' was effectively halted. This went beyond staff work at HQ. ie: Work on Montbattens prefabricated port project remained fragmented and very slow after Montbatten was sent to India.