So my question is whether we would really notice a difference moving to fibre other than an improvement in speed when sending emails.?
If your emails are not loaded with lots of large attachments, normally pictures, then email is one of the least demanding things you can do on the internet and you will notice no speed difference.
If on the other hand your are in the habit of attaching more than one picture from most modern digital cameras to your emails, then it might well be quicker in the sending. However the extra speed will make little difference unless you have rung the person at the other end to tell them to expect it, as the overall speed of getting the message across depends on how often they check their email.
I might not have been quite so keen to upgrade if I was getting your speeds, however it has made a huge (*15) difference to me.