This was White's house last year around this time (although can't remember whether there were any harvestable cucumbers or not). He talks occationally about "hot cucumber beds", so I presume this is a recreation of that, although presumably not the perspex...

Not sure if the perspex is strictly of White's time, but this was a cucumber hot bed at his house in April last year. Can't remember whether there were any swelling cucumbers in there though!