I certainly would have travel insurance. I usually get the Post Office travel insurance . This covers you from the minute you leave home to the minute you get back, so if for example there was an accident on the motorway, you were caught in the tailback and missed your flight, you are covered. It also covers you for lost or stolen items and medical problems, including flying you home if needed, with a nurse or doctor if needed (that isn't covered by your EHIC card). It also covers you in case of (God forbid) you die over there, so it would cover the cost of repatriating your body. Then there is personal liability and legal expenses, if someone decided to sue you.
Don't forget to take your EHIC card, but remember, this is not accepted at all hospitals, so in those cases you would need your travel insurance.
The Post Office annual travel insurance covers you for trips of less than 31 days, unless you pay a premium, in which case you are covered for trips of up to 45 days. If you get the individual trip policy you are covered for up to 90 days each time.