I've always advised folks needing an MOT to seek out those testing stations which don't do repairs. The reputation of such places is built on not failing vehicles without good reason; if they did, they'd soon be out of business.
This is one of the best. Busy enough to know it's a successful business; not so busy that you can't get a slot within a reasonable timeframe. The reception/waiting area is clean, with free wifi and a free self-service machine which makes excellent coffee. Separate toilets for gents and ladies are the cleanest I've seen in any garage. And if you don't want to wait, then you can walk to a retail park just a few minutes away for a spot of shopping.
If it fails, you'll be offered a free retest if you bring it back within 10 days. If you need parts, there's a GSF branch just up the road. You can sit in the lounge and use their free wifi to order them online and get the best price.
They've also got another branch near Southampton Airport.
I used them myself in 2023 and have no hesitation in recommending them.