l live in the UK and have severe Red-Green Colour blindness and wondered if l could still learn to fly?

no its against the rules. Can not fly if your color blind. l am sorry.

hey, our avatars look alike^^ LOL
i'm not sure but l know that your vision should be 20-20

Can l be colour blind & still fly?
You can fly to a PPL level license with colour blindness.
Australia was also the first country to allow u to be colour blind & still get a Commercial Licence - so there r now career options for colour blind pilots. Keep in mind that this will probably be an obstacle to employment with the major airlines, however there r many other career opportunities.
Each case is different, so this is one condition that requires the advice of an aviation medicine expert.

20/20 Vision is NOT required for comercial pilots.
Yes u can wear glasses & still fly as long as u wear ur glasses while u r flying. In fact some of our instructors wear glasses.
The main requirement with eyesight is that ur vision can be corrected to near normal vision.

Yes -- but only during the day. Color resolution is required for night flying. (US rules.)

Nobody got it right again. Sure u can if u can obtain a certificate of demonstrated ability. At least in the US. Not sure about the UK but u could ask. The feds here will take u to an airport & have the tower flash their light gun at you. If u can identify the colors, u will be issued even a first class medical certificate with no restrictions. Many fail the color test & still get their ticket this way.

One caution. Do not ever, l mean never, take u get here very seriously. Even from me. I've seen many like these here that if u took them seriously, u might miss a great opportunities. Some to other questions could even get u killed. Fun stuff playing around here. But learn to do ur own research when making big decisions.

John B is a fake

FAR 67.103c, 203c, 303c.
(c) Ability to perceive those colors necessary for the safe performance of airman duties.

The above is for 1st, 2nd, & 3rd class medicals. In the US to fly into a controlled airport, u must be able to distinguish aviation red, green & white for communication with the tower if the radio is out of service.
If u r color blind to those colors u must demonstrate that u can differentiate which color is flashing. If u know that red appears to u as brown u can tell if a red light is on. Same with green. To just about every rule there is an exception. All u have to do is demonstrate.