Note that
a) some sites do not respond to pings, microsoft.com is an example, so you will never get a reply
b) Since pings do not go via the proxies a good ping result does not necessarily mean you can view the site in question if there's a problem with the proxies or vice versa.
---------- Post added at 07:25 ---------- Previous post was at 07:10 ----------
All currently returning code 200 on all Swansea proxies.
Working OK on all but swan-cache-2, swan-cache-5 and swan-cache-7
ebuyer.co.uk redirects to ebuyer.com anyway however