Interview under caution…..hmmm yes that’s a fishing exercise no doubt, as Mbike says.
Sadly you’ve probably now admitted to reversing while facing oncoming traffic.
Its rock and hard place, as you’ve realised the bus is there and tried to get out its way. Also the bus driver should also be looking where he is gong and anticipating this…bus drivers swap routes but not enough to not know what dangers are on the route they take. He’ll know its tight for two vehicles!
IANAL but it should be the other way round, the bus driver sees you and should slow down/stop knowing no space to get round the corner.. As they are semi blind and ignorant of other road users (based on Birmingham city bus drivers…sorry if there are any present)
As you’ve said plenty to dibble then I’m guessing you may see action taken on this unless the CPS actually use their head and tell the Police to stop wasting their time…..or should do.