Barry
The conversion, if possible, would be expensive. Non-mains gas is expensive. What's wrong with oil?
Not sure what you mean by that. Containers of liquid gas? Conversion kits?
I'm not all that wise in this respect - however, I have seen a few of the things, in Rayburn-oil-gas guise, Stanley-oil, Aga-solid fuel-oil, and currently run a Rayburn burning anthracite.
Glazes for ham &cEvening all, I have made a resolution, brought on by the lamentable quality of food in supermarkets, and the absence of...
All these things are sort of OK. The oil-gas machines are far, far better (usable) than solid fuel. An oil Stanley was as good as AGA, at least. An oil Rayburn is sort of OK. You can cook with all these, but some are easier than others. You will, unless you're going to employ a full-time cook, well versed in arcane rituals and procedures, going to want a back-up cooker - if you're wondering about non-mains gas, I guess you're out in the styx. A non-mains gas cooker-hob-WHY would seem to be a very useful thing. S. Veimeister, who sometimes psots here, may supply more thoughts.
There's a good deal of "feeling" and "atmosphere" about these things. IMO they're very nice, but are expensive, and it's necessary to have another cooker. Glad I've got one, though (sort of).