Plumbing Questions? Ask a Plumber for Answers ASAP
You may heave a filter fitted to the hot water inlet that is slowing down the flow of water?
Also try stripping and greasing the thermostatic cartridge to see if it eases
Thanks for your response.Not sure about stripping and greasing , not that competent.Remembered I have Heating and plumbing Insurance with British Gas.Engineer coming out today.
Everything sorted, Thanks