The owner may well be straight up and above board, not every conversion has been put on the register, but if its not on the register then you might find that some insurance companies won't want to know, at the very least they will want to see the certificate (and quite possibly the original, not a copy), maybe some insurers are still a bit lax about such things but i've got two cars running LPG and in my experience they prefer it registered online, but will always want to see a certificate if not.

It can be put on the register but that might mean getting it inspected at an approved LPGA fitting station and they could then enter the vehicle on the register, but this is going to cost money, i could hazard a guess that £50 to £100 might cover that, but there is always the possibility that the inspector finds something he doesn't like and remedial work is needed, plus its all a faff/

Its not the end of the world, and if you really wanted the car and could come to some agreement where the seller got it put on the register that would be the best solution for you.

I had a look at the advert, bit concerned he only had two new tyres fitted, 4x4s should ideally have the same or as close as possible tread depths all round, so tyre rotating so they all wear down together is best practice, different sizes make the centre diff work hard constantly.

I delivered a few of these when new, many came new on Continental winter tyres.

edit, check the car's registration history, if it was on a personal number plate when registered on the LPG site then the current regn won't show, this is much easier to sort out for a small fee, if any.

Edited by gordonbennet on 07/01/2017 at 20:32