Hi there, new to the forum and am looking if anyone can help.
I was on holiday last week on Cornwall and on a bench under a table were a couple of strange looking insects. They were the same, but one larger than the other - six legs

- they were about 6-10mm long and had square like really bright green/yellow markings on their back, white in colour and what appeared to be a larvae near by with very similar markings - have tried looking on the
Gallery and "Googling" but cannot seem to find anything that looks like it?
Any ideas?!
Thanks
James