anyone after a security post try here ...
http://www.autopa.co.uk/autopa.htm
click on Products, then Specific bollards,
I have one from the GFC range, its mega beefy, the removeable tube is filled with concrete, I knew these were good as Comet use them as anti-ram bars for the front of their shops .... you may say over the top , but when you just paid 20 grand for a scoob you kinda like to hold on to it ....