Wickes have this chicken wire on offer at the moment, with 50% off.

It's £7.99 for 10m x 0.9m (50mm mesh size), which does the job for our hen pen.

I don't know how long the offer is on though..

http://www.wickes.co.uk/Garden-Wire-Netting/invt/187730

• 32ft 10in x 2ft 11in approx
• 50mm mesh size
• Suitable for fencing, petland poultry runs, crop protection and climbing plants
• Can be easily snipped to shape
• Hot dip galvanised