May have been covered: Specialized Tactic 4 helmet is on sale between £30 and £40 across a bunch of different colours and sizes, on a bunch of different websites at the moment.
My POC Tectal is getting a bit long in the tooth and has some issues that bother me a bit too (annoying to wear with my sunglasses), so I ordered one from Balfe’s Bikes last week with the idea that I would take advantage of a Bargain whilst the sale is on and keep it for when I need a new helmet at some point soon.
It arrived a few days ago and I like it enough that I started using it straight away. Really comfy for me and apparently one of the highest safety ratings you can get too. Plus it looks pretty modern and cool if you want that Instagram MTB influencer steez. Also I like the fixed visor, but that may be polarising.