Power supply issues: Finally found a good, and a bad one.

Right.

After much awkward messing I can declare

• Ebay item 184874479660 is a good one.
• The Labliusts kit from Amazon.co.uk supplies the bad one. It gives continual undertvoltage warnings.

Hope this helps others. The genuine raspberry one from England is a rip off here due to Amazon & Ebay cashing in with 'possible duty' charges.