Every professional job I've had here in the UK (admittedly we are little America...) required me to sign away all IP rights.
For example, the photographs of your family taken by yourself. Would you expect your employer to retain copyright?
It is the job of HR & Legal depts to make sure a contract is legally viable, not mine, and I happen to know my rights. There are at least 5 illegal clauses in my contract, and I am certainly keeping them close by if I need to go to court against them one day.