Thanks for these suggestions.
Jehmco don't appear to be available in UK as far as I can see.
Active aqua are available but very expensive. Amazon don't carry them and Ebay choices are shipped from USA with huge shipping costs but I do like the look of them and the specs.
The Hailea range look like big ugly brutes, but I'm ok with that. They seem to have loads of power, far more than I'll need at first.
This is going to be a set up for Caridinia shrimp so I don't need a huge flow, but better too much than too little, I can always set up a blank airline to bleed some of that power off. I do have space to squeeze in more tanks but I've decided to leave these negotiations till after I have my first lot set up.