The message k
from Sacha contains these words:

Have a look at the spurge hawk moth patterkiller, that has light (but
not bright yellow) pairs of spots on each segment.

It's not common, and is classed as a 'visitor'.

I can only find that on Google images as one picture which won't enlarge but
seems to be of a pear!

There you are! Didn't you say the spots were in pears?

If I type in spurge caterpillar, I get a critter
that's got reddish bits and white spots - nothing bright green to the body
or yellow to the spots.

It's the only caterpillar I know (FSVO know) that has spots in pairs.
You may have discovered a new species...

--
Rusty
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