Cheers for all the help guys,
I live in the UK, so my lamp is earthed, down a massive power cable, no skinny flex here.

I haven't checked the ampage of the lamp, but the timer says 13amps, which is surely the same as any power coming from a uk socket?

Yes, the timers i bought were the same, because the only other ones I could find have 300w or lower ratings, not enough for my 400w bulb.

Will double check the lamp fitting, but I bought the whole set-up second hand, and guess what, it was cheap. No suprise it's come round to bite me in the ass.

Bath.Bud