Does anyone in the uk know of any suppliers of the narva blue 8w t5 tubes. I bought a few back in 2013 I need some more for a project but can’t seem to find them now. Guessing they have been discontinued. Any info would be great.

More than just discontinued...
Narva fluorescents overall are no more. (they've gone LED only now)

When looking at their website one has to wonder if a real production still takes place at all. All offerings are merely "on request". Last real news could be heard at yearend 2016 when they terminated almost anything: 250 of the 370 employees had been fired at this point.

On the other hand their sales, or rather the lack thereof, already made me wonder for years how they could survive. Certainly some people would have considered bying their products, thus supporting a local manufacturer with a good reputation (Narva Brand-Erbisdorf was indeed a brand recognized for quality). But I have never seen Narva lamps in shops anymore.