Add existing users to existing sites

Hi all

Intro
I've previously used Batch Create to succesfully load 300+ students into a main network site.

Now, the need to add specific users (already created) to a specific site (already created. 60+ students.
I've created a batch list from the XLS file that can be downloaded from within the plug in and entered the relevant information.

Problem
I upload the file to Batch Create and "click here to process" the file.
The progress bar moves through and completes.
Unfortunately no users are added to the site. I've verified this by viewing the list of users in the site Users Dashboard and I've viewed the log in Batch Create.

Attempted Fixes
To try to fix the situation I've tried uploaded both an XLS file and a CSV in Batch Create. Both appear to have identical results.

Example Log
2012-10-19 11:52:48 [debug] - --- Starting queue item processing ---
Blog name: [lowerks2newhambridgecouk]
User name: [teoniew16]
2012-10-19 11:52:48 [debug] - User teoniew16 already exists (220)
2012-10-19 11:52:48 [debug] - Blog name not empty (lowerks2newhambridgecouk)
2012-10-19 11:52:48 [debug] - Blog (lowerks2newhambridgecouk) does NOT already exist
2012-10-19 11:52:48 [debug] - Blog title is empty! Blog will NOT be created
2012-10-19 11:52:48 [debug] - --- Queue item processing finished ---

Closing Thoughts
From viewing the log file I can see that the blog address has not maintained it's full stops (periods) e.g. lowerks2.newhambridge.co.uk

Could this be a factor?

Look forward to anyone and everyone's help with this. I hope I've put enough info to give us a fighting chance of getting it sorted.

Regards

Adam