Just a quick reply. My advice would be to take things steady, and pay out to see an independent Physiotherapist, which will only cost you around £70 for an hour, and £35 for half an hour. So for less than the cost of a new pair of shoes and a handbag you can have a couple of one to ones without rush.

You want to get better thoroughly not quickly. If someone is young to have a THR, then its doubly important to ensure a really good outcome, and speed of rehabilitation is frankly nonsensical.
NHS THR costs are based on cover for average treatment, and not necessarily extra Physiotherapy sessions, so these would be funded as extra, which is why you aren't getting them as routine, it's all a question of whose budget the consultations come from, and if the consultant doesn't consider it necessary he wont fund from Orthopaedic budget, and your GP might not want to spend his scant resources this way either. Sad but accurate, everthing is about funding.