The Bailiff said he will be at my home with a locksmith within 7 days to gain entry to my home can he do that?

Bailiffs are trained Bully Boys. They will har you on the day even if you have settled the Bill in the meanwhile . They will hike up the costs any which way they can. They are recruited for their lack of compion primarily. So keep some evidence of having paid some and go to the Court and ask for the Clerk there to advise you .