Interestingly I've just turned up a post on cyclinguk forum with info on what the Woodrup Jacksons will cost.
Audax/End-End in Reynolds 725 with standard lugs and all appropriate eyelets - £1585.
Vigorelli (singlespeed/fixed) in 725 with standard lugs will - £1550
Olympus (road racing) in 725 with standard lugs - £1585
Each of these frames can be upgraded to Reynolds 853 for £150
https://forum.cyclinguk.org/viewtopic.php?t=141709&start=135
For those prices, your better off going to Mercian.