RFID bank notes
UK government does not put RFID in banknotes.
The idea of scanning tickets using RFID, or barcodes, sounds so simple but is a huge undertaking.
There are 4 ped gates which deal with huge volumes at peak times, and numerous additional entry points. These would all need to link to a central database to implement any sensible system. The infrastructure to do this is huge, and is not really feasible on a large rural site for 1 week every year.