6 meters (20 feet) of BS125 to Finland is 20.11 Eur. So I guess it's more or less the same price in UK too.
Have to check how much I need and update the hose.
Just search "braided sleeving" on eBay, and you should find it. That's where I got mine. It was a few years ago, but IIRC it was less than GBP10 for the sleeving and the heatshrink (not from the same seller).
JRB
Edit: just had a quick look, and the prices seem to have gone up a bit since I last bought some (there's a surprise!).
I think it was the 50mm size I got. That gives plenty of room to get a 27mm hose in plus feed the plug-it cord through, and would also be ok for 36mm.