Thanks all for the replies and the merge of my double post, sorry for that.
I understand it's a dynamic IP, I guess having the 82 IP address for well over a year alarmed me when it changed to something totally different, I've only ever seen that happen when changing the MAC of my router, having read a bit more on sub sets etc and the input from you guys I'm feeling a little better.
I run a few services from my home, so I've had to update everything, I've also just figured out the bagu-xx-xx-v4wan-xxxxxx-custxxxx.vm21.cable.virginm.net can be used instead of the IP address, my question is now does this also change or is this a permanent link to each customer?
Thanks again all, you've been great as per