Blogger are trying to move everybody over to their new, 'easier-to-use' system, called Blogger Beta. You may have already received prompts when you log in to set up your new accounts.
Don't panic, it's pretty easy to do. With the new system, you are asked to set up a google account using your preferred email address and your usual password. Make a note of these, as these are what you will use going forward to log on to cockles and mussels. I haven't quite figured it all out yet, but you may also need to update your new profile, if you feel like it.
Once you've logged on, you'll probably not notice too much of a change. It just makes things a little easier to move around and change things.
If anyone has any difficulties getting onto the blog, let me know and we'll sort things out.
BB (aka the Webmaster)