Any recommendations? The average I'm finding is more around £1300/year. Crunch is around £700 a year but I'd rather use Freeagent over their own software so I can switch accountant later if needed.
You'll find most accountants have their own software expectations, i.e: saying to an accountant "you must use Freeagent" won't work, they dictate the software and workflows, not you. If you expect to switch accountants, expect to switch software, and so the ability to export data is what matters (and all software will support that).
Makes sense but I already have several years of experience using Freeagent by myself, and there's lots of accountants that advertise they use Freeagent too. If I don't need a specialist accountant, finding one that uses Freeagent seems a good idea and if it doesn't work out (you hear lots of horror stories) I can easily switch without the upheaval of learning new software.
I've been very happy with Maslins (https://www.maslins.co.uk) in the past. I suggest you give them a call and they'll probably answer a lot of your questions above free of charge.
I was a happy client of Maslins when I switched from sole trader to limited company. I was doing freelance software development so the switch was a doddle. You get a FreeAgent account as part of the deal and they have access to it to oversea your accounts. They will also do your personal self assessment for you too.
I’m sure they will be able to advise on your situation.