light switch with built-in timer

Does anyone know of a pullcord light switch with some type of timing device that switches off after about 10 minutes? If not, which wall-mounted switch do you recommend that incorporates an automatic switch-off after a time limit? I've seen these in pubs and restaurants, but my bathroom lights are on a pullcord so that would be best. Fed up with coming home to find the lights have been on all day!

Vicario said:

Does anyone know of a pullcord light switch with some type of timing device that switches off after about 10 minutes? If not, which wall-mounted switch do you recommend that incorporates an automatic switch-off after a time limit? I've seen these in pubs and restaurants, but my bathroom lights are on a pullcord so that would be best. Fed up with coming home to find the lights have been on all day!

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someone's going to be sitting in the bath or on the bog when the light goes out ...

Maybe a PIR occupancy detector would be better? At least when the light goes out you can wave your arms to get the light back on instead of shuffling about in the dark.

Or use a momentary pull cord switch and an extractor fan timing module.

Most of the pneumatic switches have push on timed off and so can be wasteful since no way to turn off when you leave. The push switch on a fan works well as you want it to continue after you leave. So in the main lights use a passive inferred unit (PIR) which detects movement so auto switches on and off as required.
An internet search will find loads of different units but in a bathroom of course they need to be suitable and of course will need Part P to be able to fit but something like will do the job. But at £25 plus £100 + Vat for Part P if DIY then I would think it would never pay as interest alone on investment will be more than electric saved.