I am 18 months into my Pip application currently waiting for a tribunal appeal date. During this period my conditions have worsened and I have a lot stronger case for both elements of Pip but my appeal is only focused on the mobility section. I am now wondering if a whole new application might be a more effective route to go down or could I re-apply while I am waiting for my tribunal date.
You could make a new PIP application and continue with the appeal. I have helped someone to do this recently. In his case when he started his original PIP claim over a year ago his mobility was quite good but over the last six months this has deteriorated significantly and if assessed now should be awarded 8 or possibly 10 points for Moving Around. I would suggest that you look at the PIP descriptors and check that you are likely to be awarded more points.