I got a puncture once and the guy who picked me up gave me a card for a tyre shop just off the A12 in Harold Hill. I'm not absolutely certain, but I believe it's somewhere near Dagnam Park Drive multimap link - Don't know if that helps? If not, I'll have a look for the card tomorrow when it's not so wet outside, 'coz I'm not going outside again tonight, I already got drowned once!