Hi and Welcome Kaz
There is a annual FRP meet on the 18th at Castle Combe in Wiltshire.
Looks like there are a couple of stand tickets going free, but you would need to pay for yourself to get in.
Have a look at the Rallyday thread and PM Big Boy Al if you are interested.
Depending on where in Oxfordshire, not too long a journey
Normally a cracking day out, If Alan has booked the weather Hot and Sunny.
Graham