Underfloor heating or radiators in infill extension?

[Jml]

We are building an infill ground floor extension of approx 60 m2 which will house part of our new kitchen/ diner.  The extension is L shaped and will have block and beam floor as building over a sewer.  Just wondering which heating system would be best/ cheapest/ easiest, to extend our radiators or underfloor heating?  The boiler will be moved as part of the works, and the radiator system is rather haphazard as the bungalow has been extended a number of times since it was built in the 1950’s. Trying to decide insulation levels for the extension at the moment, and having read various threads on here and ebuild, now seems the time to upgrade the proposed insulation if going for underfloor heating.

 

Any thoughts appreciated. Cheers J.