Mate, been there, done that. HMRC’s emergency tax is brutal when you cash out a big pension lump sum. But don't worry you haven’t 'lost' £102k, it's just a temporary overcharge. They assume you’ll get £304k every month (lol) and tax you like that.
Since you're on a small £12,570 salary as a director, your normal tax is nil. But when they slapped that pension payout on top, it pushed everything into the higher/additional tax bands.
Once the tax year ends (after April 5, 2026), just file a self-assessment online. HMRC will recalculate based on your actual yearly income and refund the excess tax. You should easily get £20k–£25k back, maybe even more
You haven’t lost the £102k it’s just sitting in HMRC’s bank instead of yours for now. But yeah, annoying as hell. The actual tax owed should be way lower, assuming no other income or dividend bonanza this year.