I think it was at the battle of Pinkie that English Bills met Scots armoured pikement - I recall reading somewhere that the front ranks of hte Scots were nobles in heavy arour and it was reported that longbow arrows bounced off and bills couldn't penetrate them either.

The effect of infantry weapons is rarely mentioned in batle reports unless something exceptional happens, but bills were an important part of all English armies during the later stages of the 100 yrs war (1410-1420-ish onwards) and for another 100 yrs after that.