UK PPP Health Insurance has 6 Month Requirement
I have a UK policy with PPP which i've maintained whilst I've been travelling.
I've returned after 15 months to discover that the policy requires me to be in the country for 6 months in any year in order to claim.
If they know you have been abroad they ask for proof of leaving and return dates.
I am now switching to an International policy (excluding USA and Canada) which, really annoyingly, is 50% of the UK price.