i think i would have problems with them marrying anyone who didn't want to have kids, live in the Uk, raise their kids without religion, live in a house, own a dog, take their kids to visit their GPs (natch!), treat my DC with utmost respect, go to university or be otherwise well-educated, contribute to family income or child well being or both(so, no cocklodgers or the female version thereof), no tea-totallers, vegans or other extreme dietary requirements, no communists or fascists...
basically i want them to marry people i can relate to. Skin colour doesn't come into it, though strong religious belief of any shade would be very off-putting. Any 'culture' of treating women like crap is not desirable, so that lets a decent-size portion of the population of the Uk out.
of course, they're just going to bring home loser after loser, aren't they?