£1400.00 is imo cheap for a combi change, flush, mag cleaner and alterations to suit.
Who ever said anything about flushing or a magnetic filter or any alterations?
Or any TRVs for that matter!
Nothing mentioned about the required room thermostat, maybe there is an old one there already?
Or an auto bypass either!
All these little things that I have to include to meet the best practice installations! No wonder my prices are at least £100 higher!
Tony