I made the plunge and rebased my ECW regiment onto the skirmish Bases worked out by Michael Leck. These are great and they give a much nicer realic feel to the units. I had planned to base my pike on 35mm bases to make them a tighter formation but they just didn't fit, so the larger bases are 40mm.
So it goes single model =25mm, two models =30mm, three models =40mm.
12 men in each unit.
I tried to include at least one officer in every unit. I will also be adding a 'free' standard to every unit as I think it looks very period having lots of banners fluttering. These will have no effect on the game though, just look nice.