If you are visiting London and need some additional equipment, I have used Direct Mobility Hire. They rent out a huge variety of mobility equipment on a short term basis. They also deliver directly to your hotel.
Tel: +44 0800 092 93 22
Mobility Equipment Hire Direct – is now based in London and Glasgow. They also offer a 24 hour Emergency service:
Tel: +44 0800 644 6062
24 Hour Emergency No. 07798 917 405