800 dude wrote:
Also English ale is typically very low alcohol.
It isn't really. Typical English ales have ABV's of around 4%, compared with 4.5-5% for many american lagers.
Crucially though, although the biggest selling beer today is Carling, a lager, the English ales I assume he would have been drinking in the 1970s would have been less fizzy, which would work better with running.
I saw Arthur Lydiard speaking in the mid 1990s - he said that he used to advise his runners to drink a quart of beer before going on their training runs. No wonder Snell used to throw up on most of his training runs (it's mentioned in one of his books).