Aye, there's the nub

BBC Radio 4's Today programme today reported on Members of Parliament investigating forced marriages.
Schools in Derby refuse to put up posters advising against forced marriages - for fear of offending parents.
This was described as "the nub of the matter", by Martin Salter MP.
The reason for forced marriages is to enable (mainly) young Asian men to occupy the UK - that is the real nub of the matter.
MP's could and should remove that nub - as promised by Mrs Thatcher in 1979.