Thanks Readsteadyrun. Have ordered some and I think they have arrived over the weekend, so I'll be trying them soon. That's interesting about the heel drop. I didn't buy sequence 5 at all as I had 3 different pairs of 4's on the go.
MIllsy - which brands do you use? I've always used adidas and use the kanadias for trail. I've tried asics and saucony in the shop and haven't got on with them - they just didn't feel comfortable.
I am beginning to feel that if the adidas no longer work for me then obviously I will have to try something else, but it's finding something that will fit and feel right. The adidas always felt like they were just the right fit. I have managed to find some old version 4's online and that'll do for now, but it's just a short term fix.