petek wrote:

Can anyone recommend a supplier of Sundeala board near Chorley in
Lancashire?

http://www.sundeala.co.uk/PDF/Hobbyboard_stockists.pdf

I want it for a model railway baseboard for my grandson.
Some model shops have it in 1200 x 600 sheets

That must be Hobbyboard, it only comes in 1200x600 sheets, the Pinboard
comes in 2400x1200 sheets.