First up The oil didnt run out due to bad weather. It ran out due to bad planning.
Secondly , when i was looking it was advised that for oil combis only to look at worchester bosch or grant. Having had both in rentals on oil in previous houses i put my money on a grant – and stuck it outside at my back door….whichis great till you have a multi day power cut which lets the innards of the boiler get cold/freezy on the cold water side – the heating side has antifreeze in ( we had one this year ) …. How ever i want a generator for other purposes so as part of that it can run my boiler in the are powercut
How ever unless your boilers spackered beyond repair like mine was then i wouldnt bother replacing with a combi, maybe look at relocating the tank ?