Hardy Tropicals UK

I cant work out how to edit my email addy.

should be
user control panel/profile/edit profile/edit account settings
you'll see it there

Umm, It asks me to log in again using a screen I have never seen before. And my password doesn't work. Is it admin only?

Security feature,

Just login then you can change your e-mail address.

due to using multiple bits of software we do not use the standard phpbb user accounts pages to manage email addresses and passwords.

you would be forwarded to http://www.hardytropicals.co.uk/register where you can change your password, email details.