well when I contacted the help line they were also useless not correcting my impression only saying " we will keep that in mind when we get new trains"
They seem to keep very few things in mind when they get new trains - usable bike spaces and comfortable seats were just two of the things that they forgot this time!
Just to add my two penn'orth to what others have said, yes a 700c wheel does fit in the bike hangers unless it's a very deep rim. But the hangers are a faff to manoeuvre said bike into and out of.
At least on GWR the cupboards are (in my experience) kept open. On LNER they keep them locked and the staff need to open them for you - which can be a problem when you get to your arrival station and there is no one there to let you off.