LPG is a no-no (very expensive) I'd recommend a new oil burner, as the old one would probably be inefficient and dodgy. If you do go for oil, make sure your existing oil tank is in good condition and bunded. (lined with a second tank in case of leakage) or get a new tank. I've found Boiler Juice not to give very good quotes. I made a list of oil companies and ring round about six to get the best price. Our usual supplier (Goff) then honours the cheapest quote.