Hi Everyone,
Fortunately, I live near Paul Harris who speedily sorts me out.
My first flat was due to a manufacturing fault in the tube itself, a small raised nodule which had rubbed on the tyre inner
Interestingly, though my rims are for tubeless, with silicone sealing on the spoke ends, there is a label on the rim inner stating tubes must be used. We concluded a change in regs necessitated tubes
I now carry a spare tube and spare tubeless valve for belt and braces use.
Hope this is useful.
Regards
Geof