Your glasses are almost certainly Vasart or Pirelli - its a long and fascinating story. Feel around in the bottom of your glasses. Do you feel a rough patch? If so that was done with a diamond drill during the late 1950s or 1960s and both Vasart and Pirelli did this as well as attaching and firing the decoration and the gold rims. The purpose of the rough patch was to encourage the bubbles to start from the bottom. I have some great first hand accounts of this which will be in my book on London Lampworkers which I hope to have finished soon.
The glass itself wasn't made at Vasart nor Pirelli. They bought in the glasses mostly Pilkington's Ravenhead but also from elsewhere probably including Nazeing.
Take care of that set - pity about the box.