Cheap Frontline flea-spray IN the UK?

Unfortunately pump-bottles of Frontline flea-spray (100mls, 250mls, or
500mls) cost TWICE as much in the UK as what they can be bought for in
the USA - though it's exactly the same product. Furthermore, because
Frontline packaged in the USA has not been analysed, tested and approved
by the UK Veterinary Directory, it is ILLEGAL to import it into the UK.
(To do so can lead to fines and a conviction.)

So . . . can anyone recommend a UK supplier who sells at something of a
discount?

Thanks,
Nell.