Alright lads for anyone who wants to make there own slip leads, its easy every one knows someone one with a sawing machine doesn't have to be anything the best machine, you can make loads from these of ebay and there cheap to make, this is just an example but if you want british just have a look around ebay http://item.mobileweb.ebay.co.uk/viewitem?itemId=350666702511&index=4&nav=SEARCH&nid=55026519842
I'll try get an example up for you later there string and Will hold any dog.