After a long motorway run today, I noticed the car starting to pull to the left slightly, luckily, petrol station was 1/2 mile ahead, so pulled in to find my front left tyre at 15psi 
Was only 13 miles, so drove the rest of the way home, can hear it hissing out still.
I assume it's a good idea to leave it with a block under the jack point for that side?? Can any kind of repair be done on tyres? Or shall I just order a new set of 4 http://www.camskill.co.uk/products.php?plid=m4b0s288p15203, been wanting to replace my T1R's since I got the car..

Was only 13 miles, so drove the rest of the way home, can hear it hissing out still.
I assume it's a good idea to leave it with a block under the jack point for that side?? Can any kind of repair be done on tyres? Or shall I just order a new set of 4 http://www.camskill.co.uk/products.php?plid=m4b0s288p15203, been wanting to replace my T1R's since I got the car..

They're superb for the price, I can make them screech a bit though when pushing..