I have seen this asked quite a few times on here and havn't seen an answer to it so far, you can get these remotes HERE if you need one.
Thanks for the reply HiTeck. Unfortunately we do not need a new remote control, we simply use the frequency to change the channels when we are abroad through the internet, as we have an ingenious piece of equipment called the Slingbox! This enables us to watch the UK channels from the Eurovox when we are on our holidays etc! If you do manage to get the frequency then please could you pass it on, until then we will have to change back to our old system (a little un-reliable).