Soldato
If you see one 2nd hand on ebay, you can pick these up or get them delivered between £250-£300 for a good condition unit.
https://www.humanscale.com/products/seating/freedom-headrest-executive-chair
I'm sitting on mine for the past 6 years, 2nd hand and still comfy AF.
https://www.humanscale.com/products/seating/freedom-headrest-executive-chair
I'm sitting on mine for the past 6 years, 2nd hand and still comfy AF.