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I saved this insect from a watery grave.. not sure of its identity ...  was about 1cm long and bright green... 

Maybe a lacewing, they eat aphids if it is.

Might be a Grasshopper

https://pixabay.com/en/grasshopper-katydid-1467413/

Thanks but it looked more waspish ?  I've not seen anything like before

I think its a caddis fly. Could it just have emerged from your pond? as they spend their nymph stage as a favoured trout snack!

See if you can find you rescued insect from these:

https://www.naturespot.org.uk/

There are a lot to look through.

A preliminary glance on the sawfly pages threw up Cephus nigrinus

https://www.naturespot.org.uk/taxonomy/term/19410

https://www.naturespot.org.uk/species/cephus-nigrinus

I don't think it is an exact match not least because it is listed as a stem boring insect. (although that may refer to its larva of course)

I doubt it is a garden nasty otherwise we would be able to recognise it better.

Thanks Ed  . This seems to be the nearest ... https://www.naturespot.org.uk/species/rhogogaster-chlorosoma   A green sawfly ! should have let it drowned  ( in the water butt)