I'm constantly surprised how many accountants don't seem to even make their clients aware of this option.
I quickly discovered that quarterly VAT returns were a pain, and accountants aren't cheap (for some definition of cheap).
I am also just a one man band at the moment, and de-registered for VAT about a year ago. Unless there are significant savings to be made, or you're over the £82k per annum revenue threshold, factor in the cost of the effort to submit these returns. They really are just a distraction from the main focus of your startup business.
Not to mention all the other time savings (expense receipts uploaded straight from smartphone, tax return & accounts now only take 5-10 mins at end of year using the reports FreeAgent generates, etc etc etc).
I'm not affiliated with FreeAgent (other than my referral code 44gf6bbt, which would give both parties 10% off for life). Just an incredibly satisfied customer; it was by far the best of the 3 or 4 tools I trialled.
I know of a few contractors who registered so they could claim back 20% on a new TV, new iPhone, top of the range gaming PC... Perhaps I'm just too honest but I already had everything I needed (a high end laptop) and didn't like the thought of the extra hassle. Not just the day-to-day bookkeeping side of things (I use Sage anyway) but keeping up with the changes in allowances and thresholds and remembering to submit the quarterly returns. I'd rather just get on with my job!
[0] https://www.gov.uk/guidance/corporation-tax-use-hmrcs-free-f...