i have contacted the Uk headquarters of the manufacturer of the peristaltic pumps as fitted to model sub kits like those produced by norbert bruggen, - i have a UK cost per item and its cheaper than having them sent from germany !
these pumps are 12 volt DC fitted with 4.1mm flexible tubing ( as per norberts kits)
there is however a minimum order and an approx 6 week lead time.....
anyone interested in making up numbers to meet the minimum order ??
pm me if you are interested or you want more details