Got the chair linked below and it's a firm comfortable long hours seat.
https://www.amazon.co.uk/gp/product/B0831LPLQB/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
https://www.amazon.co.uk/gp/product/B0831LPLQB/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1