Bbq is a broad church, is there a reason why it's obviously not a charcoal one?
Charcoal is a lot more flexible in what you can do - for example doing low and slow cooking a lot harder on gas than it is on charcoal, and charcoal is fairly consistently available whereas gas for the last 2 years has had peak time shortages and obviously prices are going up. Everywhere sells charcoal and it's fairly cheap. Gas can be easier to manage though, and quick to get going obviously but you sacrifice flavour for the convenience.
A lot of what people in the UK call bbq is just outdoor grilling as it's done with the lid open and direct heat from underneath, which can be from any fuel. The bbq part comes from closing the lid and a slightly lower temp circulates long with the smoke to provide the heat and flavour.
Another option is wood pellet which gives you a lot of control but it's probably fairly niche.
If you're set in gas it will come down to budget - are you just after something that is cheap and will do the job? In which case most supermarkets will have them on offer atm, or you can look online at things like outback - they're not premium but will do a job
Stuff like Weber is a step up but not built like they used to be
Or traeger if you want to look at wood pellets
For charcoal aldi do a big green egg style kamado bbq for about £399 which gets excellent reviews for the price
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Cheap and cheerful gas 2 burner job. Add to that the cost of a gas canister though, and if you don't already have a gas canister there is a scam where you put a hefty "deposit" down which you'll likely not see back ever again
charcoal ones fairly cheap.
I'd check reviews for how hard to put together, how they hold up etc and factor in cost of a good quality cover else it will rust away in a years time and cheap covers will be 5 streets away when the wind picks up