Mark, it may be worth following some of the threads on the winter climbing forum on UKC -
http://www.ukclimbing.com/forums/i.php?f=7 for conditions, you may be doing so already. One blog that is worth following is that of Steve Ashworth who gets out on the fells quite regularly -
http://www.theepicentre.co.uk/blog - he's based in Ambleside. Stephen Reid at Needlesports would also be worth contacting as he's often out winter climbing.
As you know winter conditions can change daily - it just takes something like the wind to pick up to drift the snow and your intended line can be cleared or covered.
Just hope it goes well for you on the day.