Having contacted Network Rail earlier this week via their web-chat at:
we’ve just received the following response from their on-line support centre:
"Thank you for contacting Network Rail.
We can advise that works will be undertaken this weekend in this area. We hope this should help alleviate the problems you have experienced.
Thank you for taking the time to report this issue.
We appreciate this may simply be a happy coincidence but it at least suggests there’s some awareness of the issue. We will of course continue to monitor.
Might be worthwhile others also contacting Network Rail via the web chat route if they’re concerned about train noise and vibration.