It appears that Zen is available at my backwater exchange, offering the same speeds as EE @ 150% of the cost.
It may be worth it though if the service was more consistant.
Can anyone explain to me in simple terms the value of a static ip address.
A static IP address is one that doesn't change each time you connect to the Internet. In the old days, using dial up modem, each time you connected to the Internet you may (or may not) have different IP address associated wiith your connection. As most people only made connections out of their home to websites or to mail servers, this was fine and of no issue. An IP address that changes is a dynamic IP address. Your ISP provider would be responsible for changing your IP address.
Since most people do not run services that other people, outside of their connection, connect to (web servers, mail servers, NAS boxs, FTP servers, SSH access), this isn't a problem. The fact that in the morning you have a dynamic IP address of 1.2.3.4 and in the afternoon 1.2.3.5 is unimportant. You will still make connections and things will work OK.
This becomes a slight issue when you have a service you want to make available to the world, e.g. a web server. People don't remember IP addresses, they remember names, such as news.bbc.co.uk or
www.apple.com or whatever. The system known as DNS (Domain name Services) looks up the name you type in on the URL line of your web browser, converts it to a number, e.g. 1.2.3.4 and that number is used to find news.bbc.co.uk. There is no issue if the BBC website changes their IP address as we work on names and not numbers.
The issue for dyamic IP addresses is that you have to change the DNS entry each time your IP address changes. There are plenty of systems that do this for you automatically but it's a bit of a pain when things change as it can take some minutes to propogate through the system, so you could lose traffic.
Unless you have a need to connect to allow yourself or other people services at home (FTP, mail server, web server, NAS box etc), there is no need for a static IP address. However I do check IP addresses and these days, its unusual for your IP address to change very often if it is a dynamic address, but there is no guarantee that they will stay the same from day to day, but they often do.
For the picky and pedants on here (not that there are any) -
I have tried to simplify the answer so that we don't have to get into the complexities of DNS systems, routing, firewalls, gateways, IPV4 and the lack of address ranges, IPV6 and why we really, really, really should move to it, address blocks, proxy servers, Dynamic DNS, propogation timings, multiple DNS servers, non routable IP addresses, round robin DBS, load balanced DNS, edge servers and the like.