Seriously, how do you expect anyone to help you with that little information? We need to know the exact model of the boiler and the UFH control system, whatever that may be. Or perhaps you could get hold of the instructions for both of the aforementioned and have a look for a wiring diagram?
Probably, a 5-core cable will suffice, but can't say for sure.
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local