Article continues below advertisementPrince William and Kate Middleton have been openly demonstrating their affection in public in recent months, with insiders telling OK! the PDAs are being "engineered" by William to send a clear message their marriage is firmly on solid ground following huge personal challenges - including a lingering allegation he's been unfaithful. The couple marked their 14th wedding anniversary in April with a quiet, private moment on the Isle of Mull in Scotland, where they were seen standing side by side, arms around each other, looking out to sea.