I have been renting out a flat or house since 1974 and in all the letting agreements somewhere - is a sentence that says if the estate agent introduces or shows a house /flat for rent and especially if the tentans take up the offer - then if you stop the tenancy and "move back in" you will have to pay something on a continuous basis. if you keep some or all of the tenants
Are you sure you have read the 6 pages or whatever thoroughly. If so then just ring up the agents and tell them what you propose to do and you'll soon find out whether there is a clause in the agreement.
better knowing rather than getting a claim some months down the line .