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Dry ridge is part of the quote so thanks for mentioning that. I think I'll do it, probably better to do than to not. Thanks all.
Belagerent-
It wasn't originally on mine but my roofer is doing at no extra charge (as I've already given him some more work). I thought he was trying something on, but reading up about it convinced me.
https://www.roofingtoday.co.uk/wet-vs-dry-ridge-which-is-generally-best-for-a-property/
They are a requirement for new roofs, not on repairs for existing. But there are a few articles like the above (not just on websites trying to sell it to you) that say it is superior. It doesn't look as "nice", but I will live with the different appearance for the added peace of mind.
Even if you don't go for it/want it, check how long a guarantee/warranty the roofer is offering.
Also, try and get them in to have a look in your attic first so they don't spring some additional work on you once they have started the job (if you can do so in some kind of Covid secure way that you are comfortable with).
stevo_com
I thought my felt was fine and it was only loose ridge tiles and repointing. But looking at the old bitumen felt that came off, I'm surprised more water hadn't gotten through. The new stuff is more flexible, watertight and lasts longer. Bitumen felt roofs really only have a lifespan of 10 years (or at least that's what I keep reading, some obviously will get lucky and last longer). Get it re-done, along with a dry-ridge (as opposed to wet ridge - the former uses a fixing system and the latter uses mortar) and you will A) not have to worry about leaks for the next 15-20 years and B) add value/appeal to your property if you want to sell in the next 10 or so years.