Small green caterpillar id

[Daran71]

Hi - Yesterday after being in the garden I noticed what I thought was a small piece of a plant lying on the kitchen floor and picked it up to throw it back outside. Instantly I felt a sharp bite/sting to my thumb and realised it was a creature of some type!!

I can not describe it better than to say it was perhaps an inch long, bright green, and hairy/prickly. It looked like a small piece of thistle (although there is none in our garden).

Even today it feels like something is embedded in the end of my thumb and if I pick anything up using the thumb it causes a sharp pain!!??

Any ideas??

Thanks in advance!!