Well the full list for the Norfolk locals is; Brundall Gardens, Buckenham, Berney Arms, Haddiscoe (Norwich bound), Halesworth, Darsham (Ipswich bound), Melton (Lowestoft bound), Worsted (Norwich bound), Gunton, Roughton Road and Spooner Row. I'm sure there are others on the Ipswich routes but I don't sign them.
Unfortunately its the way they've been laid out and its a compromise. The only way to make sure the bike area would always be platformed is to have it in Coach C, but you've already got both toilets and the disabled area in there so add bikes too and you'd near enough have a vehicle with no seating. Coach B doesn't exist on the 3 cars which is why it has no facilities or equipment in it and A and D are the ASDO vehicles so anything in there is at risk.
All that being said its not a massive issue, I've been driving them since almost their introduction and I've seen it the grand total of once. And in that case it took the gent practically no time to get to the right door down the train.