Alright guys,

Nearside brakelight bulb has gone (at the top of the rear cluster, not the combined brake/tail light at the bottom of the cluster).

Been down to Halfords who initially tried selling me a 21/5watt dual filament bulb. After much protestations form me that I only need a single filament P21W bulb, they sold me a 335 21watt bulb, which of course upon fitting at home doesn't work either.

Just wondered if anyone could point me in the direction of the correct bulb? Cheers guys.

I dont recall the exact type offhand, but why not just take the blown bulb with you for reference.

It tells you type of bulb required on the bulb holder.