We've just found out that we need to replace the oil fired boiler. Did a bit of digging and found that it's likely to only cost about £500 to get connected to the gas mains, as it runs right outside the house. As gas boilers are about £500 cheaper than oil ones that means the installation costs are about the same.
However DH doesn't want to swap to gas as in his mind there's more scope for things to go wrong 
, though he can't really explain why he thinks that.
My gut feel is to go with gas, as the only downside I can see is it may take a bit longer to install. But even then the worst case scenario is we have no central heating until mid October (we have an immersion heater for water, thank god!). AIBU, and can anyone who knows more than we do please explain the pros and cons?!