Ace don't be put off - even if it doesn't save you oodles of time you
have to do the SVFR route a few times just for the fun of it - average time saving* Blackbushe to Elstree in an AA5 is about 6 minutes, but since the Elstree "circuit" is now a QXC the actual time saving is neglible
(*compared to going around to the west of Booker etc)