The slip is at a white cottage, called Ty Calch, known as Ronnies.
Look at Boatlaunch.co.uk, and it's south of Caernarfon, near the golf club. It's where David and I launched from when we all went round the island.
Accessible at all states of the tide, I think. Launching is £12 (tractor launching only), free parking.
A RIB is for life, not just for Christmas.