I support a British culture not just an English one for a start off,
But what is this unitary (and it
must be unitary if can be used in the context of 'no multiculturalism') 'British culture', exactly? There isn't even a standard way of speaking English in England.
If being able to speaking English well (because everyone in Britain can speak it at least a little bit) is an essential part of the 'national culture', then are old people from Gwynedd, western Anglesey and the Amman Valley no longer 'British'? Hardly any Muslims in Britain have much trouble with speaking English anyway; broken English is more a feature of various Christian immigrants (Poles, some west Africans, etc).
Ignoring the problematic use of the term 'forcing', it isn't normal among the various Muslim communities in this country either.