Managed to get 3 hours on this from Hereford on Wednesday night.
I did not use a LP filter which perhaps I should have as the subs were very orange.
300 x 36 800 ISO,Modified Canon 450D
Guided with QHY5 and PHD
SW ED120 on NEQ6
DSS and PS CS3
Will re-process when I get home, so this is just a preliminary process:
(http://gallery.orpington-astronomy.org.uk/albums/userpics/10047/normal_M51_Hereford_21-3-12_processed_CROP.jpg)
Carole