I didn't realise these were so big. The photo doesn't do it justice, I should have stuck a a baked bean can next to it for comparison. It's shape number 80 and measures 8 1/2 inches by 9 inches - the next size down (there are 3 sizes) shape number 79 is only 5 1/2 inches tall. It seems with pots a few extra inches makes a lot of difference.
Anyway, I found it on one of the outdoor stands at Newark last week. The stall holder a had a lot of Poole Delphis plates for sale and this Jardinière didn't fit, so he suggested we did a swap for a Delphis plate I'd brought an hour earlier.
The pot was hand thrown and carved, and then painted by Christine Tate in the late 1960's.