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We used some thermoguard paint for ours (intumescent layer plus top coat) - you use their form to state the size of the beam, they email you a spec, you send them a copy of a receipt and they issue a certificate. I then gave that to building control (private not council) and they signed it off.
I guess you 'have to' remove the non-intumescent first, but once you've painted over it, i'm not sure anyone could say otherwise...
Sadly not. They painted it 7 years ago.. we forgot about it. Now need to sell the house. Headache ensues.
Trying to get info from the council on what paint and primer (if any) is basically impossible!