Looks as though I'm stuck with ADSL then. If I junk TTB and find a provider more interested in doing business, is there no way to arrange for incoming email on the old addresses to be diverted to the new domain? I fear that the answer will be NO.
It will take a few weeks to get FTTC from another provider once you have your MAC from TTB. Gives you time to set up your own domain email address[es] and to notify all your contacts of your new email address[es]. This maybe something you don't want to do but you could equally find yourself scratching around if the TTB email services changes in any way or even closed down.
You could have your 11 email addresses hosted for less than a £1 a week, here is an example of what is on offer from one hosting provider: http://www.compila.com/web-hosting/linux-web-site-ho...
but there are many providers to choose from.
You then become free to choose whatever ISP takes your fancy and switch to someone else when out of contract without fretting about email issues.
There's all the help and expertise to guide you along this path from this forum. Go for it, you won't regret doing so.