Tom , I have a pension visa 3rd year now , as I say 800k , 3 months prior from the 1st extension, ( first full year which could last up to nearly two years if you time it right ) .. get a multi entry as I do every time you renew you go away as many times as you like every week if you want , ( plus the 90 day report starts again every time you leave / return )
you don't have to have 800,000 tied up all year , just 3 months prior to extending plus get a multi as I have for example and you can still come and go as you please