pipefish,
First, take a look at the following article and the other articles linked to from this one:
http://www.animalnetwork.com/fish2/aqfm/1999/july/product/default.asp
The Reeffiller pump is a little noisy, so you very well might prefer a quieter peristaltic pump if you are going to have it set up in a part of your home where you spend a lot of time (though if you have a basement or something like that, you could actually locate the Reeffiller pump and reservoir there, since it will pump a fairly large distance).
I bought my three Reeffiller pumps from Champion Lighting. See:
http://www.championlighting.com/e/env/0001IReSU6oFl2Ympg2e9J3/index.html?link=/index.html
and also see:
http://www.championlighting.com/e/e...=/Products/Dosing_Systems/dosing_systems.html
"Reeffiller pump" is a name coined by Champion I believe, and actually this is a pump that is normally used in industrial/water-treatment applications. I had a pump I needed to send back for repair a few years ago (it was under warranty), and when it came back it was mailed directly from the manufacturer, which, as I recall, was a company called Pulsafeeder. I just did a search for "Pulsafeeder" in Google, and indeed, this company markets a pump that looks identical to the Reeffiller (I'm not certain exactly which of the differnt pump models Pulsafeeder sells are the models distributed by Champion, but I'm quite certain the Reeffiller pump is manufacutured by Pulsafeeder).
Take a look at:
http://www.pulsa.com/products/chem_tech/Default.asp?Q=cti001
I think the "Reeffiller" pump is one of the pumps in the "Chem-tech" series. These pumps are availble from Pulsafeeder in different versions (e.g. with pump heads made of different materials for specialized chemical resistance needs)...I'm not certian offhand what the specs are for the ones sold bu Champion as "Reeffillers"
If Champion can't ship to Englan, or if the shipping would be really expensive, you can probably get one of these pumps locally (from a non-aquarium-related company that sells the pumps for industrial or water treatment uses), since it appears that there are distributors pretty much worldwide. For example, see:
http://www.pulsa.com/contact/Default.asp?Q=local&country=EN&action=Search&zipcode=&market=IN
I hope this helps.
Bill