Help! Punctured far from home; no pump.

Hey all, can anybody help me out in SouthEast London. I'm in Catford and I could either use somebody's pump, or better, if I could borrow a Schraeder-to-Presta converter? Give me a call (my number's listed on here) if you can help me out of this jam.

I missed my connection at sheffield, next train is in half an hour. I get in to Kings Cross about 12. Give me time to buy a travel card and work out how the tube works (do they still shoot electricians down there?) and I should be with you around 1.30 with my pump, might come to south drinks while i'm here.