Great ideas - thanks Miles

. I will need to scale down sizes for the UK - it would take me a long time to accumulate 2kg of fish guts (no big Tuna here any more

). Seems like that might attract in some crab and lobster too

.
You're right about carrying gear in -- I am just about at my limit now, as I often have a fair walk from the car to the beach. I don't like a lot of clutter. However, for a holiday based around one or two beaches, this could work well. I was planning to try out a lobster/cray trap on holiday -- maybe place it on the way out & pick it up on the way back in.