Thanks guys. I have a few different plastics I've been trying, with which looking at your comments seem to be on the mark.
7" Gulp jerk shads in nuclear chicken, blue pepper & lime tiger. I find the nuclear chickens to be gun on Snapper.
A range of 100mm squidgies
Tsunami 4" & 6" shads in pearl spot & sea trout. Interestingly, I've have most success (more good hits) on these cheaper Tsunami's, especially when smeared with S-Factor.
Like most lure fishing I think you need to keep mixing it up until you find the lure/lures that works on the day.
I'm heading to the Clyde for 3 days this week so I'll be giving it a good nudge on plastics so fingers crossed I can land one.