BTR 520 Full Route Only £0.00 The BTR 520Is a 520km circular route through the Kingdom of Wessex, passing through or close to many of King Alfreds fortified Burgh Towns.It can be started / finished at any location. There are lots of main line railway stations close to the route.This download is for the full route / non editable as a gpx route file. Add To Cart Added! The BTR 520Is a 520km circular route through the Kingdom of Wessex, passing through or close to many of King Alfreds fortified Burgh Towns.It can be started / finished at any location. There are lots of main line railway stations close to the route.This download is for the full route / non editable as a gpx route file. You Might Also Like BTR Collection £10.00 BTR Loops Collection £6.00 Wessexgrvl.cc Bidon £10.00