If your currently running mods on the car, or plan to mod it in the future then may as well go for a walbro 255 lph. £80.00 new or £40.00 secondhand off eBay, pistonheads, etc.
If your planning on leaving car standard, then there are plenty of breakers that sell 2nd hand pumps from £20.00 upwards, but you could be faced with the same problem in 6 months or less,might as well go for the walbro for reliability imho.