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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).
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.