only boiler i can think of in that region that is half decent is Potterton Performa 24 Eco HE. Biasi's are in that region too. You are looking at approx £700+ for a decent boiler these days.
£650 will get you a Band A premix 32 kW Biasi or Heatline, perhaps also a Ravenheat or Halstead Eden.
These are economy boilers but will give good service if they are properly installed. That includes a gas supply conforming to the British Standard with a pressure drop of only 1 mB at 35 kW boiler load. That means a gas supply pipe size of at least 28 mm if its more than 4-5 m from the meter.
The rather cheaper hybrid boilers like the 28 kW Biasi M96 or the Potty Performa HE are closer to £550 and are more tolerant of gas supply inadequacies.
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