Hi Tim,
Me again, I should add, I have the 2.2 200BHP, I have done about 30'000 miles since Nov 2017 when i got it and never had any DPF issues at all.
I use Shell V-Power and every 3 fills or so I add a bottle of Wynn's Gold treatment to the tank.
Prevention is better than a cure and the cost of using a premium fuel and 2 bottles of snake oil a month is minimal when looking at refurbing or replacing a DPF.
Dom