Thanks for you reply Rick.

"The sky's rotation is fastest near the the celestial equator (0 degrees declination) and least near the pole. Its rate decreases with the cosine of the declination. "

That is something I should remember! Im going to have to dig my OU books out.

Its good to hear how you got on with the scotch mount. 400mm for 30mins! If I can get remotely close to that success id be happy. I might have to get building this weekend. Or bidding on ebay!