"YouGov " is a survey company set u[ by Tory Politicians - their findings in favour iif right-wing policies have been called into question on several occasions.

I repeat what I said earlier:(for those with the attention span of a gnat)
Below a serious discussion of weighting before we have the usual contemptuous dismissal of yougov by the usual.

http://ukpollingreport.co.uk/faq-weighting