Yes, you can leave Thailand and stay in the UK for 5 months on a Retirement visa with a valid re-entry permit. There is no specific limit on how long you can stay out of the country as long as you return before your re-entry permit or visa extension expires.
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Tod *********
Totally no issue at all doing that
If you have a year extension and a valid re-entry permit there is no set amount of time you need to spend in country.
As long as you'd come back before your current extension/re-entry expires so you could apply for a new yearly extension you're fine to stay out as long as you want.