The sea slugs are Sea Lemons, Archidoris pseudoargus
and the crab is the Flying Crab, Liocarcinus holsatus
Both are widely distributed around the British Isles and the Irish Sea.
That ligule is about 1mm long.
Where to next? Got a plan for the weeekend which hopefully will include another year bird but the weather forecast doesn't look overly promising and we cuold well be scuppered.
In the meantime let us know how green the grass grows on the other side of the fence in your outback.