Jezza i have the exact same thing on the same wheel.. but it is the slowest punture EVER!!... two weeks ago in halfords some bloke pointed out my rear was almost flat!.. slowely drove to garage to put more air in, then to tyre place to get it off and checked... no obvious leak!!.. bit wierd... then 6 (yes 6) days later came out one morning and almost flat again!.. this was last friday!!now, either someone is playing funny buggers OR im expecting to come out tomorrow morning and it be down again... if not, some mailto:tw@t">tw@t is messing around!!! argh...