Halogen heater with 1 bar of 400W rating. It can have up to 3 bars if you replace the 2 other bulbs/ bars, which are easily available through Ebay.
I didn't want the job of dismantling the heater so I'm offering it via Freegle.
The remaining bar seems fine and works well.
Halogen heater (Sherrard's Green WR14)
This offer has been gifted to someone and is no longer available.