It looks like a really wide road, is there any reason why you parked like this in the first place?
Anyway, please give us the PCN number and number plate, also please confirm if you are the registered keeper and if not what your connection to the registered keeper is.
I don't think Harrow are contesting much if anything at the tribunal, but before we get to that you have two rounds of representations where you can ask for a discretionary cancellation, so you might as well make use of that.
Have you had any PCNs from Harrow before?