Result!

Rang USAirways and spoke to a VERY helpful chap called Paul, he's sorted out everything including assistance at Philly & MCO, seat reservations for the kids and best of all 2 bulkhead seats for Miriam and me in 8 A&B on both longhauls which means I get some Legroom and no one in front of me to recline into my knees!!!!!

Only downside is the kids are split 2 & 1 in seperate rows but that may not be a bad thing!.

Also rang BA, 3 calls to get it sorted, all they have done is made a note in the system that I'm taking a wheelchair, no offer of assistance or seat requests.