Despite checking the tyre as much as I could in the dark there was a small sliver of glass in the tread which nicked every inner tube after a mile or two.
This is the reason you should always line your tyre logos up with your valves. Makes it much quicker/easier to narrow down the location on the tyre where the problem is if you can line the tube up quickly.
Clement xplor 35mm
Despite checking the tyre as much as I could in the dark there was a small sliver of glass in the tread which nicked every inner tube after a mile or two.