This looks like a great event on the 18th, 19th and 20th of October for mainly 1970's & 80's rally cars in a non competative tour starting in Bath with Spectator stages at Cirencester Park and South Wales including Celtic Manor. I've booked my tickets for Cirencester, only £5.50 in advance.
There's an entry list of over 100 with many well known cars and drivers taking part. Have a look at the website Lombardrallybath.co.uk.