What was this game?

[Bigmeat]

Please help before I go mad...

I'm trying to remember a game I used to love in the arcades in the UK.
I think it's from the mid to late 80s.
It's a side scrolling shooter in the vein of Nemesis and Salamander.

I recall it had a choice of 3 robots (or battle-mech type suits?) - blue, red and white.

They could be upgraded with pick-ups.

I don't know if it was ever ported to console, I only ever played it in the arcades.

Thanks in advance for any info or leads on this game.