Hi Hedge, the pot is from the Tupperware section in Wilkinson - Wilkinson's own brand (£1). It is a microwaveable container made for 0.4L of liquid and it comes with a lid. The walls are pretty thick as I struggled a bit to make the holes.
I have potted already and the end result is a lot heavier than the previous pot so I guess it will not fall so easy now. My first experience with Hydroton is great! It is a lot easier, cleaner and trouble free to repot in comparison to bark.