The problem in our profession is that a lot of the cost is labour. You have to put 20% on top of that and there is nothing you can claim back.

The only cost you can reclaim is on materials. There is also clawbacks on power/phone and various other overheads, but all in all it is going to cost you more. Doing the paperwork isn't all that complex unless you are doing imports/exports and stuff with multiple rates. And today you can do it all (and pay

) online.
Let's say you are doing a frame where the materials cost you £24. You charge £50 for the labour. Total retail = £74
If you were vat reg, you could claim back £4, making it £70. But you would have to pay 20% of that to the HMRC.

So that means essentially a retail price of £84. Ten quid dearer.
Without labour, just selling on stuff - say a readymade frame you bought in: Cost to you £6 - sell for £12. You made £6
With vat, you are liable to pay £2 vat. But you claim back £1. So you made a fiver.
Fuel is vatted, but the procedure is different and unless you are running a fleet of vehicles it's not worth trying to claim it back.
If you are dealing with people who are also vat reg then it makes things easier for both parties. It's a bit of a conundrum. On one hand it's best to avoid it like the plague. On the other it will tend to stifle your future business growth if you try to keep your turnover under the threshold. And there is the vague impression that you do tend to get treated more seriously if you are vat reg.
One point.... If you do register, you can *reclaim the vat retrospectively for
everything you have in stock that you paid vat on. Equipment and all.

As long as you still have the stuff and you have the invoices.
* At least that was the case when I registered.