Daughter bought herself a seat heater that can be used at home or in the
car. She plugged it in the car and started changing the settings rapidly and
it blew the fuse!!

F3AL 250V is a sticker on the casing and mentioned in the instructions as a
replacement fuse but I can't find that actual part in the uk (I've googled,
honest ;o) )

The fuse itself has SEB on one half with 3A250V on the other and is 5mm x
20mm glass.

Anyone point me in the direction of where I should be looking?

The 250V has thrown me considering its for vehicle use at 12V!!

Thanks.