I have owned a bakers/sandwich shop, lost during/after Covid.
Now I have no idea where this shop is located, but I can say with 99% certainty he's in dream world expecting £60k. As is often pointed out on here, you're effectively buying a £40k a year job. If you applied for a job, then were offered it and they said "we just need 60 grand before it's yours".... what would you say.
Potential has no value, if that potential is really there then the current owner could realise it, and maybe then he would have a business worth 60 grand. It's not your job to do that for him.
The easiest thing is to look around at all the equipment and work out what it would cost to buy it all - second hand, of course, not new. You have no more guarantee that a freezer and microwave you buy off him is going to last any longer than one you could buy off eBay. There is lots of second hand catering equipment around at the moment and again without knowing the premises then I reckon you could kit it out for £10k, £15k tops. So what's the extra £45k for? I agree that the goodwill and customer base has some potential but what's to stop you opening a cafe 2 doors down and throwing a load of money at marketing.... would it really cost you £45k to build up some business? As that's effectively what the difference would be.
Appreciate the ease/convenience of buying the shop as it is but generally when I have seen these things sell, and had discussions around buying them, anywhere between £15k and £30k tops is usually more realistic. In fact one shop we looked at buying started off with almost the exact same figures - the owner there wanted £60k as she claimed she was making £35k a year. After failing to sell it at £60k, then £50k, then £40k, I know she eventually sold it for £13k.
Adding on deliveries could work especially if the place isn't on any of the main platforms already? UberEats was a massive income boost for us - especially breakfast time as we had no competition other than McDonalds. Have a look online at 9am or 10am what options there are in that area on UberEats, Deliveroo etc if it's sparse then that could be a good easy add on. But as mentioned above, factor in how that would fit in workload wise if the shop is busy at those times already.