Could you tell me what bird this is please

Could be a leucistic greater spotted woodpecker (assuming you're in the UK) Leucism is a condition that affects colour pigmentation and melamine.
HOWEVER.... I'm only on my phone and my ID skills are ummm questionable

Too small for great spotted woodpecker and wrong proportions IMO. Can't suggest anything as colours washed out (not sure if it's the photo,the bird or both!). Proportions possibly siskin, but not sure.

I go for siskin too.

In reply to ItisaRobbo:

This one is mainly white

Hi

Tail fork depth and primary projection length could point to Goldfinch?

S 

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In reply to seymouraves:

May well be right. Hopefully it's poss to get another photo?