Hi UK2C,
Happy to hear there's movement on your application!! I got the exact same request but for my spouse last Thursday. I had to wait until today to submit it because my spouse was out of town and I wasn't sure about the signature. I went ahead and submitted the first page and the 4th (the one that has the signature) today, my deadline was this Thursday 17th. The weird thing that has me a bit worried now is that I got a ghost email at 11:00 AM this morning,
BEFORE I submitted the schedule A.... I was hoping to get that email the day before my ECAS changes into DM but I don't think that's going to be my case because how can they make a decision if I was yet to submit the requested document? :/ ...
Anyways, I think you should be good by just completing the first page as requested... the signature page was not requested but I sent it out anyways as a reassurance.
Good look with the next steps

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