3995 / 3996 did have removeable roofs, however their bodies weren't too good when the roof was removed, so the roofs are left on all the time.

There is some possibilities that they might be converting more in house. But if it's a one bus thing, well they might be looking at introducing open top tours similar to Go South Coast / Southern Vectis.

Examples (some good and some prob bad)
Hexham to Kielder
Hexham to Corbridge via Hadrians Wall
Newcastle - Quayside - Angel of the North
Sunderland to South Shields
Derwent Valley route Metrocentre to Consett (Get to see the Red Kite birds better)