Wheelchair users will find that the older theatres in London have less accessibility and narrow isles - many of these are protected listed buildings and very limited with regards to making improvements for disabled access. The newer theatres and buildings provide wider isles for wheelchair/scooter access and improved disabled facilities - these include disabled toilets, amplified sound systems for the hard of hearing and infra red sytems with headsets. There are some theatres whose performances are translated into sign language and if you have a guide dog, the staff will look after it during the performance. The facilities offered vary and it is always a good idea to check with the theatre before you decide to go and see a performance.
There is a very useful guide about disabled access for the London Theatres on the Internet - this has good information about performances, local parking, toilet facilities and wheelchair accessibility. www.officiallondontheatre.co.uk/access
Below are just a few of the theatres in London which have disabled accessibility features.