The plans changed after it was confirmed they would not have taxpayer funded security, it is understood.
England's last-16 World Cup tie will kick off at 01:00 BST on Monday, after Fifa reconsidered bringing it forward.
In an untypically candid interview, the outgoing PM tells the BBC it was "really tough" to accept his political career was over.
The King says the countries have forged a relationship "founded on friendship, trust and a belief in liberty".
His parents say there is "uncertainty" about movement and feeling in his arms, wrists and hands.