Both petrol and Diesel engines have cambelts that need replacing at X miles, ditto clutches and DMFs.
The alternatives are chain driven which require good servicing to keep in good order and if they fail are a whole next level of work and cost top replace.
The happy medium is to find cambelt driven engines that are simple to replace belts on, as even chains will require replacing at some point, and might well have worn the camshaft sprockets to boot.
The alternative to clutches are automatics, and these vary from old school reliable torque converter types thru less reliable right to ticking time bomb twin clutch and automated manuals at the other end, but even the most reliable TC units won't be reliable if you don't maintain them properly and if you drive the thing like you stole it engaging violent kickdown every few minutes they too will wear and break.
Its like with everything, there are good and bad bets.
Depending on where you live in Norfolk it is quite well served by well priced LPG stations, www.filllpg.co.uk/index.php?page=lpg.php running on around 60ppl LPG means you can run petrol engines with the equivalent power to Diesels economically, albeit you may well be paying a lot more in VED costs for the pleasure, you find them now and again used but rarely do people who have invested in LPG sell until they've had the best from it, so buyer beware, will cost anything from £1500 to £2000 to get a quality conversion with pressurised flashlube injection on a 4 or 6 pot engine with decent power output...our last 4 cyl conversion was £1750 due to higher power output requiring large LPG injectors plus a high quality flashlube system, be careful of people fitting systems appreciably cheaper than this, research extensively if this is of interest.
My Diesels have been reliable, but they have generally been carefully chosen, not only avoiding DPF's, but from marques with good reputations (even if their later behaviour and models don't always live up) and with good histories and conditions to begin with.
I'll make a Diesel suggestion to you though, find a (must be facelift so 2006 on) W211 Merc E220, say of 2007/8 vintage, with lowish mileage, and a proven service history preferably from a make specialist indy workshop who sensibly ignored long term oil service cobblers (you will need to keep this up), these things will cover 400k miles without too much to worry about so long as they are serviced well...facelift only because they dumped the troublesome SBS brakes at facelift, sorted out the many previous electrical issues and galvanised the body.
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