Hi Andy,Clive and John
Thank you all so much for your helpful advice and information, I cannot see any hole in the drawing, so it could be an old MOD plate weld hole, who knows.
I am going to send the pump back to EICS and I hope to get a replacement without to much fuss.
If anyone comes up with anymore information, I would be most grateful. Sheaun at Carwood, Coventry did say, the are often welding these pump casings, so it might be a common fault, only keep your eyes open guys, as the hole was hidden behind the MOD Sticker.
Richard