Why wouldn't it be? Of course it depends on your specialism, some are more relevant than others but what is engineering if not the understanding of physics and forging of that understanding into a solution?
From there on, your only areas of potential concern are the MSc entry requirements but these tend to be much broader than the equivalent undergraduate degree requirements against A-Levels.
Finally, getting chartered down the line by a professional membership body would also involve making sure that the MSc you will apply for is accredited. The Engineering Council is your friend in that case:
http://www.engc.org.uk/faq/academic-qualifications/is-my-course-accredited.
What's your specialism or line of work involving your current degree if you don't mind sharing?