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[Mr Phoebus]

Business cards or old train tickets make a useful "get you home" patch. Deflate tyre, place card twixt tube and tyre, re-inflate (and keep your fingers crossed).
Assumes you have a pump and a bit of card to hand, but this is normally more likely than carrying a spare tyre.

Years back I did that. A Walkers Beef 'n' Onion cellophane packet was used.
Yesterday I was just being bloody minded and every turn of the wheel I was expecting burst ear drums too.

It's a hernia.

Excellent diagnosis.

 

[Mr Phoebus]

Blimey! Well, you might get another couple of rides out of it, but I'd think about changing that soon

I wish I could. It's now got odd tyres and I've got to change the back one now to match.
Such is the tart in me.