Many thanks for the response so far.
Having seen the Basic Impetus list and the suggestions you have made regarding the English force, would I be right in using:
1 box Edward I Cavalry (Heavy Cavalry)
1 box Military Order Warriors (Heavy Infantry) with
1 box Medieval Levy (1) (Heavy Infantry)
1 box Medieval Crossbowmen (Skirmishers and Mercenary crosbowmen)
This just leaves me short of longbowmen, therefore would I be right in using the archer figures from the Henry V set.
For the Scots, I would use
1 box Army Robert the Bruce (Heavy Cavalry and Heavy Infantry)
1 box Medieval Levy 2 (Heavy Infantry)
1 box Scots Army of Wallace (Heavy Infantry)
Again this leaves me short of longbowmen, perhaps I could use Zvezda's English INfantry 100YW?
Many thanks
Jeff