Yes, I reckon you can. I’m in a class D area and it’s more a ‘fly with caution’ than ‘fly and you die!’. If you follow the CAA Dronecode and fly responsibly you should be ok. Just don’t ask me to post bail for you.
The NATS one is because of Manchester airport, I fall in the red zone but can fly most places more than 5 miles from the airport. imho you can go up to 400ft at Jodrel Bank
bit of a thread dig on this however It should be fine to fly…HOWEVER. I would expect allot of signal interference just like when I flew around Billinge hill