Gathering a letter and a number from the other caches in this series to find the Bonus cache will lead you - via the co-ord correction info on the back of the logbook - to this Bonus Bonus cache!
To find this cache: You'll need to read the co-ord correction info on the back of the logbook for GCB-Bonus! Geolympix Cyclerama Series, which you can find by collecting letters and numbers from caches along the way. Take those co-ord corrections and apply them to the 'fake co-ords' for this cache, as given at the top of the page. Depending where you start, you may be able to find this cache on the way back, or need to backtrack... forwards? Note, the cache is NOT at the above co-ords. This is a random point on a line between the East and West ends of the series.
To reach this cache, you'll need to travel a little away from the trail, but there should be easy access. If you find yourself without a clear route you may have the wrong final co-ords...
Caches along the Phoenix Trail:
Thame Moreton Circle - 01*, GC01-West Ender, INDUSTRIAL REVOLUTION 1 (short detour)*, GC02-Not the Ivy!, GC03-Rocky Moment?, GC04-Sleeper Cell, twixt Thame & Towersey*, GC5-Beware the Rabbit, GC06-Classic Hide, Old SideTracked - Towersley Halt*, GC7-Rest Awhile, GC08-Off Track, GC09-Yumcrete , GC10-QEF?, GC11-Tree Cover, GC12-Stand Sit Jump!, GC13-Reflective Space, GC14-Lost Signal, GC15-Blasted Thing!, GC16-Eclipse, GC17-First Class, GC18-Rooky Error, GC19-Isolated Location, GC20-Bridge Hand, Virtual Insanity*, GC21-Gated Community, GC22-Antlers, GC23-Front Door, GC24-Around the Bend, GC25-East Ender, GCB-Bonus!, GCBB-Bonus Bonus!
*Not part of the Geolympix Cyclerama series, but you may pass close-by along the way.