Personally I won't cross one if it's lit, unless specifically instructed to do so.
Absolutely 100% correct!
And if you do, at any airport having NATS as the ATS Provider, it's rated as a 'Runway Incursion' and could invoke the filing of an MOR.
Even if ATC's given you a 'conditional clearance', if the reds are still red when you need to enter the runway, hold position and query the clearance.
