Chas - don't worry, I've discovered that I can actually play with just about any type of pick, some just get chucked quickly with an accompanying yuk! So if I get stuck on a desert island without my favourite picks I'll be OK; well... As long as I have a guitar and lots of strings and someone to play and sing with and music and... Well food... Ok so a desert island is not for me.
...
Anyway; I digress. How unlike me.
So over the last few days I've been trying lots of different pick; thicknesses from
O.52 mm to 2 mm; materials nylon, delrin, duralin, ultex, tortex and some other polymers that I can't identify. Some of these materials may well be the same type of polymer under a different commercial name. I've been surprised at the difference in feel, sound, control, grip and all round playing fun. I've found myself gravitating towards the 1.0 -1.2 range and am currently favoring the Dunlop 1.14s in tortex and delrin which have quite different sounds.
Here's a couple of piccies - yes I am crazy.

This is them arranged by thickness and type.
Arranged by thickness range. Aren't they preeeetty!
And here's the ones I'm favouring.

It's been fun. So what's your favourite type of pick or is it a case of 'who cares?'.
BTW - thanks to Hydroman, Dermot, Nessa and everyone else that suggested types of picks. It's been a fun journey.
Michele