carplan tyre mate for emergency repairs to flat tyres and punctures. just shake the can and attach to the tyre and empty the aerosol into the tyre.
save getting your hands dirty changing the wheel, or great if your spare is flat too!
just went into the local sainsburys filling station and was marked up as £7.99 on the shelf and scanned as £1.99 at the check out , so went and bought another two for the other cars! not sure if it is a national glitch or not, but worth a try?