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I'm assuming as he has the guttering in it's already draining somewhere even if only onto the ground.
I've got two water diverter kits and two butts from Homebase that are inserted part way down the existing drainpipe and only tops up the butt (one for each butt) until it's full and then continues to drain any overflow water down the existing drainpipe
MTB-Idle
Good plan but make provision for an overflow as you’d be amazed how quick waterbutts fill up. Either drain to a gravel filled trench out the way somewhere or pipe it to a rainwater gulley by the house.