tobyed - yeah, I'm wondering the same. I have HydrX (it's a slightly darker than pea-green green, BTW) and Dark Blue UV dye but I dunno how it will mix. If I chuck enough in I'm thinking it will go either blue or maybe an almost navy/black colour. I'll do a few little tests on it first and let you know.
I've heard some bad things about Parcel Force too. I dunno who handled my MCP600 when it arrived, though, as my girlfriend received it. It was really quick though
And thanks, I'll check out Safeways. The current plan is to buy battery topup water (de-ionised water) from Halfords, which is essentially distilled water but with a few extra things done to do it. I think you need about a gallon or something. That's about 2 or 3 litres I think. Never was good at conversions.
I'll start putting things in the case tonight and measuring things up.