The current Rally GB is a pale imitation of its former self. It covers a fraction of the stages it used to, when it used to come as far north as Clumber Park (near where I live). Nowadays it's all based around Cardiff and should really be called the Rally Of Wales. Not that that is a problem for your partner
I also hear that you have to pay nearly £20 per person to get into a stage, and the marshalling is very efficient in keeping people to 'official' tracks (thanks to Dave Richards). I haven't witnessed this myself, but it did put me off making the trip down to Wales last year.
Sorry to sound negative, you'll more than likely have a fantastic time
