Here are a pair of suggestions to upgrade the toon tour to euro 6 buses for the CAZ

1. purchase a trio of E400s from London, or somewhere else if no London ones, GAL seem to stoll have a number of 56/07/57 E400s aswell as a pair of 06s (unless they've been sold like the other 06s). when GNE get these they can repaint 2 to toon tour and one to the 2019 corporate livery and obviously convert them to open topper aswell as upgrading the emission standard to euro 6, If they weren't already upgraded in London (which can be done on E400s as arriva has done it to their E400s)

Suggestion 2. Purchase 3 new open top volvo B5TL/Wright Gemini 3s for the toon tour (like the ones on the Edinburgh tour) as they'll already be euro 6, there will be 2 delivered in toon tour and the other will be delivered in 2019 livery.