Borrow a handheld GPS?

[cwk]

I'm not sure if this is the best forum, but here goes.....

Does anyone here have one of those handheld GPS jobbies, and is willing to lend it to me for a few days? I don't need anything too complicated - just one that displays your speed with reasonable accuracy.

I'm based in SW Herts not far from J17 or J18 of the M25 and work near Piccadilly Circus so anyone local to those areas?

Don't want to buy one because the wife may well cut my knackers off if I do.........

Thankyou in advance.

Charles