Here are some of the things found in the lake;
http://www.gtj.org.uk/search/simpleSearch.php?srch=llyn+cerrig+bach&lang=en

There were slave chains as well, 6 massive neck links apparently, some finds are attributed as offerings to the gods to stop the advance of the Romans.

Llyn Cerrig Bach - Lake of Little Stones

Ann Ross who writes about the place in her Lindow Man book, says that it was probably the site of an important sanctuary, the gold and probably slaves offered as sacrifice, as the traders came over from Ireland, it is a pure iron age site, that was obviously destroyed after the roman victory...