Fuel pumps replacement! Help!!!

Hello everyone.

I was wondering if any technicians or mechanics in the UK could help with this. Where do you buy your fuel pumps i.e. online or from distributors? Which OEM equivalent fuel pump brand would you recommend I buy and why? Also, have you had to stop using a brand? If yes, why?

I have not had very good experiences with OEM equivalent fuel pump so your advice will help me in taking a decision going forward.

Thanks.