@screenman I don't think the OP has a bike, he runs
Sounds like you have the same issues as me, just have to persevere I'm afraid. However, if the exercises hurt, do fewer reps. If they really hurt, stop, go back to the physio and see if you are doing them right. It may be that they are simply too much if your calves and glutes are really weak. Any new way of using muscles will likely make those muscles sore to start with until they adapt to the exercise
I would say you are being too hasty, I was told my issues would take months to resolve. Indeed, 3 months on, I have no more calf length. That said, my knee specialist has told me not to overstretch my calves as it exacerbates another issue (muscle irritation caused by a bone spur in my fibula).
You have 4 sessions to get diagnosed and to get an exercise programme, Bupa then expect you to carry on your rehab at home. They pay for the treatment of acute issues, not chronic ones (regardless of whether the policy is unlimited). Muscle tightness is likely a chronic issue that has developed over many months if not years, and will likely take months and not days to resolve. Unfortunately any knee issues require an enormous amount of patience and can be extremely frustrating!
Have you seen a knee specialist, had scans etc (I can't recall)? If things really are getting worse with more time, your physio should refer you to the appropriate doctor.
When do you see the physio again? Can you not call him if concerned, this is a better strategy than asking on an Internet forum, he's seen you
If you really want a new physio (I would say it's far too soon), see one who is attached to a specialist sports medicine clinic, see what your local private hospital offers.
Do you run in a club, see if any of your running buddies can recommend a physio and then see if Bupa will cover. But I'd use the 4 sessions, then if needed see a specialist. If they then recommend more physio, Bupa will sign off more sessions. They need to see either progress, or that you are trying other treatment avenues (I have at least 3 or 4 years of dealing with them) even if those avenues come with bigger bills, which is a bit mad, but understandable, consultant appointment is £200, physio £50. Bupa aren't there to keep you in condition for your chosen sport, but to be able to learn how to function in daily life. If you need ongoing physio, sports massage, conditioning training etc, you'll have to pay yourself