There is an eBay seller called paulsanglingsupplies who I got my poles from. I have got a 10m, 8m, and 5x 4m (for another antenna project) from them.
The 8m is great. The 10m I wasn't so happy with a couple of the joints, but some coats of varnish sorted that out, and 4 of the 4m ones were perfect, the 5th not as good but usable for my project. Worth a look, and a lot less than £50
Steve I have seen him on ebay but will not ship to Guernsey.