Heathrow stand info sought.
 

Is there a resource somewhere that can tell me what category each stand at Heathrow falls into? I'm talking about the areodrome reference code letter (A to F) as indicated in Annex 14 page 1-8, regarding the aircraft wingspan.

I understand that only aircraft of small enough width and length can fit on certain stands and this is indicated by a code that each stand falls into. So far, I have only heard of stands from C, D1, D2, E1, E2, E3 and F for terminal 1 but I can't find any mention of which stand is which code.

Any help appreciated!