We got a worktop from Woodworkers in Harold's Cross, Dublin recently.
[broken link removed]
They are listing Walnut as follows:-
American Walnut 5000mm x 625mm x30mm€785.00
This seems better value than your panda quote...
By the way - if you do contact Woodworkers, ask them if the wood is Forestry Stewardship Council (FSC) certified - they didn't have a clue what that meant when we asked, and it's good for them to be aware of it..! All B&Q wood is FSC, and it would be great if others followed suit. But both Walnut and Panda seem to be fairly sustainable... For further info:-
[broken link removed]