Had an email yesterday from VM:
"We’re carrying out essential works to modernise and future-proof our network in your area on Mon 11 Oct. This should improve your connection so you can carry on enjoying the things you love most. "
Now while I'd consider 'enjoying the things you love most' to be unlimited Brandy served by naked 20 year old supermodels while I watch re-runs of Kelly's Heroes, I guess it's more likely to be something to do with this roll out