Hi Paul. Sweet Dreamzzz here.
Joe has a decent Gill harness that has been modified for him. It still fits him and indeed will fit a large size range. I used it on my contender but it was always much too small for me. Joe is now 15 and 5.5 He had a new banks for xmas, lucky lad.
If you want it £20. I can leave it on the stand for you as we are there on Sat morning, first shift!