[andy east sussex]

I need to set up as guess no one in area wheres the best place to buy a ro kit from im not needing much water to start with so not sure if to go for a 3 or 5 stage or go for a full blown ro 4040 unit but wheres cheapest to buy it all from

[herbiefatboy]

go to website called gaps water treatment that will give you some idea.

[Michael Peterson]

i run a whole full round off of an unboosted 450 gpd ro

[DeLuce]

You could give Purefreedom a ring. They are quite friendly and will give you a good idea of what you need. I started off with the 450gpd ro unit and it still doing me proud. I let it pour into a 1000ltr tank in my shed.
Alternatively, you could Google wfp supplies and you might find someone nearer to you.