Went to Doctor's to be told "it's probably cancer and you need a scan to check it but urology's closed due to covid, so you'll have to wait". That was in April, I'm now having all the classic symptoms of testicular cancer and urology is still shut, so my choices as I see them are - Die, get better, or remove my own testicles just in case and die of an infection
There are quite a few things you can do if you want to be an irritant in the side of the NHS. If you sit and wait for them to call you, they often won't.
I would- go to urology/oncology in person and ask to speak to the secretary in charge of appointments, or call this secretary- look up the consultant to whom you were referred/or dept' and phone this secretary and say you will take any appointment, any cancellation, anything if you can be seen.
Also, go back to the GP (a different GP) and explain the situation and ask for an urgent 2 week referral, then chase them by phoning the surgery every few days to ask about the referral and the scan (as the scan could be done even if an appointment was not certain).
Private- I get it costs money, one thing you can do though is pay for the initial scan, and then they will refer you back into the NHS system, you don't have to do either/or, I would have that initial scan (borrow, ask relatives, crowd-fund, anything to get that initial one done, I would lend £500 to a friend for this) as then you know what you are dealing with- there are lots of causes of large testicular lumps and many are not cancer, so it would at least give you the answer of whether this needs immediate attention.
Finally, I agree with those who say go to your MP and get through the system that way.
The squeaky wheel gets the most attention in the NHS sadly- and some of this stuff couldn't be done during lockdown, but now services are slowly up and running and you might have to be very persistent to get attention.