Anyone?

I have received a letter today stating that from next Monday all residents will be issued with a parking permit for there allocated space. They have also stated that the allocated spaces do not allow parking for commercial vehicles, caravans, trailers, horse boxes or boats. The other thing they have said is that visitors will not be able to park on the road but only in the 12 visitor bays. The problem with this is that they are giving them on a first come first served basis to only 12 residents out of approximately 150. Any other vehicles will be clamped. I have a nanny for my children that parks in my space during the day and my friend who also lives here has a commercial van. We both rent our properties and none of this was in the contracts and has never been an issue before. Could anyone tell me if they are able to do this? Many thanks Zoe