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Thanks. Yeah I emailed the technical people at the roofing store I got it from and they said it looked fine and that the air bubbles would probably dissipate on their own with time.
The water but is going to be in the deepest darkest depths of behind the building so I'll probably just get a cheap plastic one tbh. I've heard they can freeze over and crack over winter so need to think about that. I haven't ruled out running a drainage pipe and digging a soakaway in the garden.
The roof looks great, I would leave the bubbles as they are. I'm not sure if it would be possible to reseal it with a hot iron and towel, I would be worried about the wood getting wet.
I saw some upcycled water butts at the Makers Central Exhibition, the oak barrel ones looked great.