I have a peach tree in the Uk.
Thank you for your question, Pete. It is difficult to diagnose a disease wthout examining the plant tissue, but your plant appears to have cankers on the trunk described here: http://plantclinic.cornell.edu/factsheets/cytosporacankerfruit.pdf This may result in the wilting of the foliage new growth, but that symptom is also caused by one of two fungi described here: http://ipm.ucanr.edu/PMG/PESTNOTES/pn7426.html Although control options mentioned in these Extension articles may help, it is recommended that you seek advice from a local horticultural source familiar with your local pathogens and available controls. Since you don’t indicate where in the UK you are, I am afraid I cannot help you find one. But the web should turn up something nearby. Good luck!