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I would second the recent recommendation elsewhere for Wood Finishes Direct and their customer service team who should be able to advise you.
I think they like Mann's products, and I've used Mann's varnish and stains before with good results.
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Has building control told you you have to, or are you doing your own research? If you’re using private building control give them a call and double check.
IIRC big wood joists are weirdly more resistant to fire than steels.
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I have protected timber panelling with a intumescent primer under osmo - cant remember spec off hand. The beams might be resistant enough (they char slowly before failure - is the theory) but surface spread of flame across the ceiling would be the issue i expect.
tbc
dbr
Sheppz
@fredtc
Because I'm an idiot I specced a bare spruce ceiling + beams in our kitchen extension. This means I have to paint it with intumescent varnish which is a total pain in the ass and also doesn't improve the wood visually. The manufacturer have told me I can use a water based varnish during the process to improve the finish. Osmo top oil is sort of what my mind jumped to, but obviously that's oil based. What can I use that's water based, not horrifically expensive, and will do what top oil would?