Robin,
I should have loved to join you but I'm not free on that day.
I have only played Bowood once and I thoroughly enjoyed it. I was taken round by a young assistant pro who, intelligently, didn't try to show me how low he could score, but instead to show me the shots on the course - playing balls from various different spots. Very informative.
I also played Slaley Hall with one of the assistants and he took lots of risks to show off some of the golfing challenges. I know that many are quite rude about Slaley Hall on this site, but I enjoyed that experience also.
Mottram Hall is local to me, but I've only played it once. The front nine are pretty dull, going round and round a flat field. However, seven of the back nine holes are really quite good and seriously challenging on interesting, undulating ground.
I have played the Brabazon at the Belfry (13 years ago when I was not as feeble as these days) and I enjoyed the challenges of the good holes (notably 10th and 18th) but the rest of it was hard work as it was in a damp autumn. It took me ages to clean my clothes, clubs and bag.
I don't know how much of Dunham Forest is Dave's, but I really like most of the course. Many say that it is too tight between the trees but I have never suffered at its hands. It is a Jewish club and if I am a guest there I know I will be very well fed and thoroughly entertained with the humour. The code number for their locker room was 1939 - you get the gist.
Thomas did quite a bit of remodelling work around the Manchester area when he was pro at Dunham, sometimes with Alliss. They combined on a rebuild of Didsbury when major upheaval was caused by the building of the (now) M60. It was a MacKenzie course, but it is now rather a sad mixture of some classic holes and a load of less satisfactory stuff crammed into corners here and there.
I have also played Dewsbury and District a few times, and it has some exciting holes and some really oddball jobs!
Enjoy your day out!
I've not played any of his Spanish or Portuguese courses, but I have played Cannes-Mougins in the south of France. It was an oddball course with one utterly ridiculous hole turning through a right-angle. I think it was an Alliss/Thomas duet.