Brompton update; Turns out the air escaping wasn't down to my shonky taping. I stanley-knifed any tape that was creeping up the rim so there was no chance it could be preventing a good seal, but still the air seeped out through the tyre bead. So, next course of action is another tyre, maybe a non-folding variety this time (in case that's the problem).
Yeah, CSB.
Brompton update; Turns out the air escaping wasn't down to my shonky taping. I stanley-knifed any tape that was creeping up the rim so there was no chance it could be preventing a good seal, but still the air seeped out through the tyre bead. So, next course of action is another tyre, maybe a non-folding variety this time (in case that's the problem).
Yeah, CSB.