So this took me longer than expected - once you have the right tools its easy & works a treat! Zero annoying creak
Started out with a spray can of grease - this was too thin and harder to control: Being close to the brakes I gave up on this plan.
Instead i bought a syringe from amazon and used some thicker grease. Also with the syringe it meant I could do it without taking the wheel off (with my 18" wheels I couldn't see the part on the fronts even on full lock) instead just feeling for the rubbery bit.
As info for others - I used this cooking syringe from amazon :
www.amazon.co.uk/dp/B001HZMOII. Pretty well made & did the job.
Cheers guys for the help!