I think that in view of the fact you are returning in August, you should take normal UK Insurance. Before you sign up, make sure that they will give you a 'green card' for each three months you will be away. Then just before you depart the UK each time, ask for another 'green card'.
By 'green card' I refer to a card which used to be green. This gives you fully comp cover in European countries. If you don't ask for one, you will only have the minimum legally required cover in the relevant country.