I’d echo the comments about contacting the medical section or an AME.
They are usually very helpful and keen to get someone flying wherever possible.
There are actually a few options:
- A full EASA PPL requires a Class 2 medical or higher
- An NPPL with UK privileges including carrying passengers
- An NPPL with safety pilot (or solo)
The full PPL has defined medical requirements that you can read here.
Have a look at the section on Haemotology for the Class 2. A lot may depend on your history and the underlying medical condition.
The NPPL has a requirement based on the DVLA Group 2 professional driver standard and you can use a medical declaration from your GP.
If you don’t reach that standard, you can get a Group 1 declaration that is the same as saying you are fit to drive a car and will be subject to the safety pilot or solo limitation.
The NPPL is only valid in UK airspace at present.