I had to go to Watling Tyres at Swanley to have the punctured tyre repaired properly. The RAC guy came yesterday and we pulled out the screw and he did a temporary plug. The temp plug is restricted to 50mph so it was a long old ride up the M20 to not exceed that! In the end it cost £40 to have the rear wheel removed and the tyre plugged. So much cheaper than a new tyre! Plus properly fitted plugs by the likes of Watling (other tyre specialists exist too) is perfectly fine and legal. I would thoroughly recommend this branch to anyone that wants to ride-in/ride-out. If you take your own new tyre they charge £20 to fit and balance.
A Rocket III Roadster Blog - Life and travels with a Rocket