I don't know where you are located BT but this is the guy I called in to fix my old Potterton. He's a top notch old-school type who knows how to actually repair a boiler rather than just replace bits ad-hoc.
www.miketheboilerman.com/glow-worm-ultimate.html
He's based in Hungerford now and charges travel time so maybe out of scope for you. Maybe give him a call? He'll probably be able to tell you what's wrong over the phone.
Anyway, isn't it the perfect opportunity to install a ground-based heat pump while you're filling in the sink hole?
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