The Wombat range of chairs can come with electric height adjustment.

Thanks Julie - do your mainstream secondary learners use the Wombat?

I believe they are designed to go up to teenage years and also do adult chairs  too.

https://healthcare21.eu/wp-content/uploads/2020/08/R82-Wombat-Living.pdf

smirthwaite do the Indigo chair,

indiGO the supportive school chair for teenagers - Smirthwaite

its footprint is larger, and the handbrake is a bit clonky, but i like the lateral support better. a rep will do you a teams meeting to demo the chair and its accessories if you ask. The massive benefit is the charging cable is a standard cable - like a kettle cable so you can get cheap replacements. We find vela chargers go missing all the time and are over £100 to replace!