So Sony have sneakily updated an article on their blog, detailing the subscription cost rising from 22nd September. Hoping this wont reach the UK, but it probably will :(
'Update: Starting on September 22, 2016, prices for PlayStation Plus memberships will change to $59.99 USD/ $69.99 CAD for twelve months and $24.99 USD/$29.99 CAD for three months. The monthly plan will change to $11.99 CAD in Canada, and remain $9.99 USD in the U.S. If you are a current member, the new prices will take effect if your membership renews on or after this date.'