Thanks for the replies guys.
The building is clad with King Span insulated panels, the doors are insulated too.
The floor panels I bought 2nd hand on Ebay, they are 6mm thick plastic designed specifically for workshop environments.
The Series 2a is probably my favourite actually, so much character !
Ground works today, 80 tons of Type 1 has been delivered and will be compacted.
The edge between the driveway and lawn is being edged with recycled railway sleepers to keep the top layer of shingle from getting on the lawn.
We are also setting 'H' section steels into the ground at the far end to form a retaining wall of Sleepers - pictures to follow