Can anybody identify this little Beauty

Hi, all - just found this thread! Looks to me like a sawfly - there are several which have wasp-like colouring, and the fact that a number of pupae were found in one place would tally with that. I'm pretty sure it's not a true wasp, and the only other similar insects I can find are a couple of parasitic ichneumon flies which feed on moth larvae - and you'd be unlikely to find a group of pupae all together. So my money's on something which might have fed on the leaves of the plant in the basket and then gone underground to pupate....
Hope this helps!