Kayos
Gone......
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I think he simply turned the Saunders valves off he certainly didn't drain anything down .
Well I obviously wasn't there but a boiler old enough to need replacing will need pipes altering. Not possible while they are full.
For reference, the last oil boiler I fitted was around £5k plus vat, the price you mentioned seems reasonable for a combi swap, they are heavy hateful things to move. Still lumps of cast iron in oil boilers