I've seen the mini bike branded as 'Fixei'. I actually have a regular 'Fixei' as my thrash around bike.
http://www.flickr.com/photos/create_up/4558263850/
www.fixei.co.uk is down, but you can have a look on here for contact info: http://web.archive.org/web/20110208154022/http://www.fixei.co.uk/
I know a distributor in London who used to stock them, but they don't seem to have them anymore - http://www.single-speed.co.uk/ - you could try getting in touch with them and asking if you're really interested.
EDIT: Looks like they may well have them for treefiddy: http://www.single-speed.co.uk/fixei/fixei-mini/
@J0nathan started
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I've seen the mini bike branded as 'Fixei'. I actually have a regular 'Fixei' as my thrash around bike.
http://www.flickr.com/photos/create_up/4558263850/
www.fixei.co.uk is down, but you can have a look on here for contact info: http://web.archive.org/web/20110208154022/http://www.fixei.co.uk/
I know a distributor in London who used to stock them, but they don't seem to have them anymore - http://www.single-speed.co.uk/ - you could try getting in touch with them and asking if you're really interested.
EDIT: Looks like they may well have them for treefiddy: http://www.single-speed.co.uk/fixei/fixei-mini/