I need to replace a bath shower/ tap mixer. There is a side bath panel which I was not able to remove myself. I would like to get a side panel fitted afterwards. How much would it cost?

you need to put this as a job advert on this site and get quotes off local tradesmen

this is probably something you can do , after you remove the old panel see what backing is in place refurbish if necessary and pick up a new one at BnQ secure it to your new backing and presto you should be fine. if it don't fit as you might want to measure it for size, fit a wood one also available at that store and plinthing to paint if necessary

where are you based??