Thanks for the feedback, that's very useful. I think I will try and tweak it so that you're sent to Twitter first before I ask for an email and password. The re

Thanks for the feedback, that's very useful. I think I will try and tweak it so that you're sent to Twitter first before I ask for an email and password. The reason I do that is that you can have multiple accounts, and each Twitter account can have multiple collaborators, so I need to keep Twitter accounts distinct from user accounts. I can, however, reverse the setup and as you say I think that would be less confusing. You're not the first to mention problems with the authorisation process - I will look into that. Thanks again.