I got a call from the Conservatory Firm on Thursday to say they would be taking down the old conservatory this week, which is good news and on date, as they said that works would start five weeks from placing the order with them. Hopefully work will continue and foundations dug and walls built, etc.
The old shed went on Thursday evening, it was dismantled and taken away in under an hour.
The new plastic shed arrived on the day B&Q said it would, it came in a big polythene wrapped box and was sitting on my drive when I got home. I put it up on Saturday and it only took an hour. It seems well made and feels pretty sturdy, the obvious main benefit is that it should be maintenance free.