I can answer from a general PoV as a disruption volunteer. We're instructed to look out/seek out for passengers with disabilities in queues and so on, and to prioritise them. Similarly, in terms of hotel accommodation, the approach is to provide the Sofitel (when available) to minors travelling alone and to individuals with disabilities.

With regards to rebooking, automated tools like OPR and Disruption Transfer will rebook in the same/comparable classes and then provide an option. Should none be available, or should the date not suit you, the best option is to get hold of a 'human'. This might be over the phone, or with a duty manager.

I can only imagine how stressful flying might be for you, and I'm really sorry you had to endure that wait in LHR on your last trip. Unfortunately, as an airline we do not have specific equipment beyond the wheelchairs that are provided by law by the airport. Have you reached out to the PCMU team? They might be able to assist. https://www.britishairways.com/conte...-and-pregnancy