Tarty Bikes will supply just about anything you want for BikeTrials... very quickly.
Summer Lane Rocks.. About 30 seconds from Jnct 21 of the M5.. several areas of mid size rocks around the lake.
Sand Bay... Secluded Bay to the North of Weston-Super-Mare... Large areas of dumped rocks used as breakwaters. Great when the tide is out, touch wet when not!! Sun does not get onto these rocks in winter at all and they can be very green.
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Various locations around Clevedon Sea Front.. jnct 20 M5 Halfords nearby if you need emergency parts!
Cumberland Basin, Bristol 3 hours free parking near the Cafe under the bridge