My original A1200 which I've had from new is a 2B with the double sized clockport. It was completely useless with the Apollo 1240/40 I bought new at the 1999 Cologne show. Lucky for me my friend had a spare A1200 he'd picked up from a junk shop for £5! It came with an overdrive hdd as well! I borrowed it from him and it worked fine. I think it was a CBM 1d4 but I can't be 100% certain, it was some years ago and that machine is currently missing...
I have a 1d4 motherboard for sale that used to be in my BlizzardPPC tower setup. Worked fine with that, should be ok with the Appollo if that's any use.
Cheers,
Rudi.