The answer to this question is that there is no reason why two parties in the US and in England can't create an effective and legally enforceable contract. Advice from a US attorney for companies expanding to the US on understanding the differences between US and UK contract law.English contract law is the body of law that regulates legally binding agreements in England and Wales. Need legal advice on contracts and agreements? Our expert commercial law solicitors and attorneys can help you. The simple answer to this question is yes, a UK lawyer can work in California. However, there are important steps to take before you can do this. The applicable law to a contract throughout its duration should be the one in force at the time of its signature. There are two ways for UK law graduates to practice in CA: 1. Complete an additional 1 year of law study at an ABA-approved or California-accredited law school.