What have Vodafone done in Heaton Moor (Stockport)?

I noticed the download speed drop when I got home on the Tue the 9th Dec and noticed from the Vodafone site that some work was being carried out. Checked again on Wed evening and it says the work is complete!!
I've lived at this location for 14 months and typically got an average of 80Mbps (more than adequate). Since Tuesday evening, when I got home, I now get an average of 3Mbps at best, both inside and outside the building.
I have a SIM based router, which hasn't moved in 12 months, with a Vodafone SIM (via Lebara) with also a personal mobile and work mobile both on Vodafone showing the same data speeds.
Does anyone know if this is going to be rectified? The other mobile providers have the same speed which is why I went with Vodafone, now they're just as bad!!

UsedToBeHappy have you taken a look at the Lebara network coverage checker yet to see if there are any issues in your area? It's likely temporary, especially if some recent work was done on a mast but it's defiantely worth taking a look at the coverage checker as a first step.