FA:
a) it's BPK; might make things interesting when you ident the VOR before using it ...
b) if it's a nice day, good gin clear VFR etc, why not route LAM (or rather, Stapleford) - Ware VRP (or Broxbourne Lakes if, like me, you avoid VRP's like the plague) - Royston? The VORs around London tend to attract a hoarde of people all seemingly flying without looking out of the windows at the best of times... This route has the added advantage of a lovely long straight Roman road you can follow...
c) on the way out, try and avoid Gransden Lodge if you can (my personal bias), routing either towards the west of Cambridge (nice views!) or Sandy Mast (the 801'agl jobber) would be my bet...
Further north, Wyton can't provide anything other than a FIS (no radar) and your best bet is Cottesmore Zone, 130x2.
Hope that helps...
-D