Any link to it?
The only thing I can find is an article from 2006 - https://www.telegraph.co.uk/news/uknews/1510866/Poll-reveals-40pc-of-Muslims-want-sharia-law-in-UK.html
'poll reveals 40% of Muslims want Sharia Law in UK'.
a) 40% is not 5 out of 10, if this is the article you are referring to.
b) If this is what you're referring to, it's been 17 years since then. And Sharia Law is not a mainstream law or governing policy in the UK. So much for all the scariness that it's going to take over, right?
c) 41% of Muslims actually opposed Sharia Law based on that article. Funnily enough this is not mentioned by you.
d) only 500 people were surveyed. I'm sure even you can understand that this is a significantly small proportion of people and can't realistically or sensibly be applied to all Muslims in UK. Not least 17 years on...
If you have any other links/references to an article backing up your quote, do provide it.