Yes I have had this as well with my whitelisted UK ads. There is some stuff you can do to minimise the impact, but generally speaking there will only be certain affiliate type stuff you can promote. Depending on what sort of stuff you were trying to advertise before, there may be ways to optimise it to get back – send me a PM and I will look at your pages if you like.
Google is definitely biased towards some of the big boys e.g. how this is not a bridging page I will never understand: Online Casino Guide – Best UK Online Casinos by CasinoChoice.co.uk . I guess the rules don’t apply if you spend £1m + a year!