Try Michelle Jackson from the saddle company - she will come out to you and can fit on site she often has 2nd hand saddles as well as new and can adjust on site - no sending away at all. She is very very good and well worth trying. I have reccomended her to quite a few people and all were really impressed with her.
Her number is 07786 083582 Shes local as well (Chorley way) Tell her Sam with Alfie gave you her number and she will sort you out a good deal.
Forgot to mention if you didnt already know saddle company saddles are fully adjustable with a 10 yr guarantee on the trees - excellent if you have a pony that changes shape/ difficult to fit. My Lad loves his saddle and my mum who had a wintec concrete block on her welsh sec d converted earlier this yr - every time she rode in the wintec she suffered from hip pain for days - it hasnt troubled her one bit since going over to a saddle co saddle - they are super duper comfy for both horse and rider.