Whale Water Pump Cover 'flap'

I'm sure on here somewhere is a post asking about a replacement cover for the Whale water pump inlet, which had broken.  He was only able to buy the full inlet at a fairly substantial cost and there were a couple of replies stating that the flap was not available separately any more..  We discovered today that Dickinsons in Bradford sell just the flap, for £5.99 which is a much better deal!