Balirob - see the doc , see a specialist if you can , doppler scan of the leg may be useful .. to be blunt.. . look after it, sort it or lose it.
I have some experience in this area , chronic venous insufficency both legs , odema both lower legs, thrombophelbitis , cellulitis , gangrenous ulcer , genetic on my dads side , plus loads of sports abuse ( kickboxer ) , then I got diabetes . Had surgery to remove veins , recommended not to fly due to pressure changes that would give me DVT .
Compression ( below knee ) stockings can help but the must be the correct strength otherwise they cause more damage .
Massage with moisturiser
rest with toes higher than heart - raise the bottom of your bed , makes it easier for the blood to return to yr heart . .
Good luck Rob - I would have struggled with NHS help .
Hamish