It seems to pop the fuse as soon as I rev the engine when riding away.

I sit on it while engine running its fine, its fine at tick over, soon as I go to accelerate away, boom, fuse goes.

It still could be vibration causing a frayed wire to short to earth, but...

It could possibly be a dicky voltage regulator which is causing over voltage? Does your headlight seem abnormally bright? Does it get significantly brighter when you rev the motor? Does the dash backlighting vary in brightness with engine speed?

If you have a multimeter then check the voltage across the battery terminals with the engine (and ignition off), then at idle and finally when reving the engine at >4000 rpm. Let us know what the readings are. You should not get more than 14-14.4V even when bouncing the motor off the rev limiter.

It could also be a failed diode(s) in the rectifier (part of the same unit) causing AC voltage to leak through into the system which can get as high a 60V off a three phase alternator. The above voltage check should highlight either problem if it that.

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Nothing gets any brighter or vary in brightness when engine is revved.

I don't own a meter, and wouldn't know how to use one, so that will be for over the weekend now and get someone who does and knows what they are doing to check.

If you're not confident or don't have the equipment then it may well be worth paying a visit to your local auto-electrician.

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A simple rev of the engine is blowing them, so will get someone who knows how to work one to have a looky.

Charging system checked and all is well with that.

We then unplugged each indicator individually and replugged, a fuse then blew when plugging in front right, so we thought we had found the problem, however, with that remaining unplugged and a new fuse in, the ignition was turned on again, and another fuse blew.

Indicator relay ?????? is now the theory, thoughts on this ????

Scratch that relay theory, just changed relays and it popped again as soon as the ignition was turned on.

There'll be a short somewhere. Patience and going through everything with a fine-tooth comb is all that's required. Keep at it and you'll find it.

Don't forget to check the sidelight circuit too.

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Just to add, the fuse one is blowing with fuse 3 removed, despite that not being the case earlier.