Given that in the UK a degree is 3 years and an MSc is typically 1 year, I would do an MSc. Delaying work by one year isn't much in the grander scheme of things

Given that in the UK a degree is 3 years and an MSc is typically 1 year, I would do an MSc. Delaying work by one year isn't much in the grander scheme of things. Once you've started working you'll find it hard to come back and do your MSc. I would recommend doing it at another university though and make sure you find a program that interests you. This is so you can broaden your network and meet faculty and students at another place. I was advised to do this by one of my lecturers, I ignored the advice and stayed at the same university but in hindsight I can see I would have got a lot more out of my MSc if I had gone somewhere else. I did an MSc (in mathematics though) and feel that it opened doors for me in my career. This may be less true for computer science though.