Cheaper

OK, it's only a small component and a tiny amount of cash, but if anyone wants to do this on an absolutely minimum budget, I have just found:

• 15 mm chrome-plated Cu pipe clips, pack of 10, part number 17694, £1.53 from ScrewFix,

(instead of what I bought (u-shaped clamps = 15 mm saddle clips, pack of 10, £2.18 from B&Q).