Thanks for the responses so far
No i didn't try stars towards to zenith, but that's a good idea to check local conditions. I haven't tried saturn at the same time either to compare.
I've just had 2 weeks off work and was amazed that i could not get just one night with good seeing! Mars is always hard, but this year it's been impossible

to get a good visual glimpse. I even looked at the collimation of my scope, but it looked ok. The summer heat must adding an extra factor too. oh well there's always Mars 2010 to look forward to!