Underfloor heating works best with air source heat pumps, so just switch to that.
Then run a wee bit hot water through your cast iron rads for the look of the thing.
Then run a wee bit hot water through your cast iron rads for the look of the thing.
Yes, the heat pump will take an efficiency hit for using radiators rather than underfloor heating. I'd say that's just part of the cost of living in an old house.