There are a number of issues raised by other posters and I agree that the support available LHR is unacceptable.

Last year I had knee replacement surgery which meant I required special assistance in getting to the plane once I was fit enough to fly. Over a period of a month or so, I had very good help at EDI, DUB, ABZ, BOS and GLA.

However, my one experience of LHR was appalling in spite of plenty of notice to BA. I too was transferring from a DUB (where the help was excellent) flight arriving at T1 and transferring to T5 to take a BOS flight in CW. The first problem at LHR was no help was available to help me off the plane at T1. I had to make my own way down the stairs at the end of the jet bridge to the bus. On arriving at T5 I was told to wait at the special assistance point near the bus drop off point. I was there for nearly an hour, in spite of many requests to take to through security to the GF lounge ready for my flight. The response was, "there's someone coming".
15 mins before scheduled departure a 'pusher' and chair arrived and had to take me directly to a C gate. By the time i get there boarding was nearly complete. I just made the flight but the stress was immense AND I was denied lounge access.

I complained to CA customer relations, who in effect said, "Nothing to do with me mate, try complaining to HAL", which I did. They passed me on to Omniserve, I received an apology and an invitation to join a focus group on improving customer experiences at LHR! Even though I have pointed out to BA that according to EU and US equality legislation that they are ultimately responsible for the services provided by others (HAL and Omniserve), they deny responsibility. No compensation, no proper apology from BA.

The following website may help the OP in their complaint:

http://www.reducedmobility.eu/how-to...el-rights.html