There are re-entry bans in place to prevent people who have been removed from the UK, returning within certain periods, however this does not apply to those wanting to come on family visas. He will need to prepare his visa application carefully but being removed for working illegally in the past should not prevent him from returning as a spouse.
You should seek the assistance of an immigration solicitor in making your application to ensure it is properly explained.
No, she can marry anywhere. As long as the country the marriage is conducted in considers it to be legal then we will accept it as being legal.
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