PeteJ

Thanks Kirks. We've gone for a custom job...
 
For anyone interested, the parts list is:
 
Flag ribbon as above (50mm x 400mm / 150 g/m2 ISSF spec) c.50p each (25m roll)
10mm aluminium poles (B&Q) c.£3.50 each
Stainless steel 1 mm welding tig rod (free...)
Multipurpose plastic rawl plugs from B&Q (£6 for 50)
Small beads from Hobbycraft (£3.50 for loads)
 
We're mounting them like golf flags so we can mow over the capped holes and find them and not worry about clearing out the holes every time. We can't have any concrete down range, so the plastic pin cups are ideal:
 
PVC golf pin cups (ebay - £2.50 each)
Golf flag plastic ferrules (c.£2.50 each)
 
Pics to follow