I had a chance to catch the evening tide as well, so took 15 minute ferry ride to devonport, spent about 3 hours digging aluminum and pull tabs, bit got rewarded with a nice keeper :
Its only 1.35 9ct, but i take it :-)
i ma not posting all other crap i found today - just a whole pouch of aluminum.
Here is a Video of ferry ride and a ring find :
Happy Hunting, see you at the beach :-)