Ditto on paying cash if you can. I'm in a similar situation, in that I'm waiting for my ILR to be approved. It doesn't look like that's happening anytime soon though, and I really need a new car. Meanwhile, my bank can't approve my loan without ILR- I explained the situation, but unfortunately they didn't make any exceptions for Covid and extended visa wait times...
Admittedly, I'm a brand snob and strongly preferred Toyotas or Hondas. But, I expanded my search and found a car that I didn't really consider before, AND I can pay cash for it as it's less expensive! I'll need to borrow some money from the husband to buy it, but I can swing it. So, it just worked out and was a win-win all around.
Not to sound like a naysayer, but just to share my experience... I tested in an automatic 4 years ago, and have zero regrets about getting an automatic license. Manual wasn't for me, period. I've never had an issue finding automatic cars over here! Check out Autotrader, Motors.co.uk.