Sometimes playing problems can arise as a result of the accumulation of faulty postural habits that we aren’t even aware of. Many music colleges provide Alexander Technique lessons as part of formal training to help raise awareness, but it can be an area that is overlooked once a musician leaves college. The website below has links to details of qualified teachers in the UK.
If you’re unfamiliar with the Alexander Technique, there is a description
here on YouTube by the Nobel Laureate, Nikolaas Tinbergen, who devoted a significant portion of his Nobel lecture to talking about the Alexander Technique and the benefits he and his wife experienced from lessons, which is well worth a watch.