Im looking into it and there might be a way forward with it, they are possibly bringing out a new Scheme with duke of Edinburgh, in which you do not actually need a professional assessor to meet up with. Instead you just log the amount you do and send video's and pictures to either your D of E leader or an assessor online.
There is a possibility that this is going to happen, our leader is going to a meeting on some information about it, but this will be great if it happens.
However fortunately for me a club has just opened up for our school, and we are getting a professional in to teach us, but although it will be beginner standards she will still be someone to assess trials biking.
Im from Melbourne, near Chellaston. Where do you ride?