Hi
You did say in your original post you were in the Northwest near Liverpool. I added one timber yard to the list in the North West it is:-
Houghton Timber
High Walton Mill
nr Preston
Lancashire
PR5 4DG
01772 323566
It is actually on two sites and family run. They are hoping to have one site for timber storage and another for machining. George seems to be in charge. However they are quite dysfunctional. In the past George has been very helpful and willing to dimension timber for me. Lately however his extended family have become involved and he has said it does not pay to help out the hobbyist. He said he had some western red cedar for me which I ordered but it never turned up. He said he had been searching for it but that someone else had sold it of but he didn't bother to let me know. Dependent upon what you want he usually lets you have a look. At the moment however he is only at the mill on Wednesday and Saturday mornings.
Perversely we have a large hardwood timber importer on our doorstep "Hardwood Timber" in Huyton but they don't sell to the public.
C.W Berry in Leyland has a little known hardwood timber section in its huge yard. you can walk round and select what you want but they are unable to machine it onsite.
In my search for dry cedar Hardwood timber pointed me in the direction of Haldane Fisher in Garstang who had three pallets full but very little other hardwoods.
Hope this helps.
Mal