Looks like a Junior. Not the greatest boiler ever, lots of plastic components and a rubber gas hose that perishes and splits. They're also very dirt-sensitive - the system water must be absolutely spotless or this happens....
Its a Worcester Junior, not as bad as the Intergas Lovers on this forum make it out to be. I look after hundreds and they are pretty reliable. Get someone in togive it a proper service, gaskets, electrodes etc.
If you're looking for a reason to renegotiate the price for the house then we may not be of any use to you here. It seems from your comments that you're going to buy the house anyway, and (eventually) replace the boiler.
How long will existing boiler last? Who knows?
Should you replace it with LPG or oil? That's up to you.
I have no crystal ball on the price trends for the various fuels.
Yes,you're right that I'll purchase anyway.
No, not looking to renegotiate - price agreed is based on the need for extensive refurbishment.
But as the house is to be refurbed (including knocking through walls, re-wire etc) that is the time to change or supplement the heating if I'm going to, hence trying to judge whether the age/efficiency of current system makes it worth keeping rather than the additional expense of changing.
Oil is cheaper to run but much more expensive to install, so it depends on how long you're intending to stay at the property, as it'll take a long time to recoup the difference.
On materials costs alone, assuming you're staying with a combi boiler, you're looking at around £1k-1.2k to stick with LPG, or around £4k-4.5k to switch to oil. Oil makes a bit more sense (for several reasons) if you go over to a system with a hot water cylinder, but it's still more expensive to fit
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