Fitted one of these in my Mum's house, they sell for up to £100 some places (this exact model).
The next one's up are remote control ceiling mounted ones by triton and cost £300-400.
It's a glorified hairdryer that's safe for use in the bathroom, but it's good for elderly people with back/movement problems, and it's easy to use and fit.
Powerful 1.0kw motor. Auto-start. Light weight construction and slim design. Shaver adaptor built in.