Just ordered some proper cutters for ali from cutwel - http://www.cutweltools.co.uk/,

6mm 2 flute ali power cutters - £7.00 each
3mm 2 flute ali power cutters - £7.00 each

6mm Ali power ripper cutter - £18.62 each

Stocked up on WD40 as well (easier than making my own!)

Asked them about the K2 coated carbide throw away's and they are still doing them at £2.50 (up to 7.9mm dia) so ordered some of those as well.

Will let you know tomorrow how i get on.