Who Do I Believe?

It seems that Ford's Powershift has more than its share of problems at the best of times .... see video in auto vs manual thread  .... £300 against major gearbox problems might be cheap at half the price. 🤔 But I'd take the car to a recommended independent  rather than a main dealer.

As a lifelong driver of Ford's including several Powershift, it is well known the problems that can occur with the gearbox if it isn't serviced promptly and regularly. The gearbox service is separate to the normal car service and isn't included in the regular service schedule. The advice is to service the Powershift box at 3 years or 37,500 miles whichever comes first and every 3 years or every 37,500 miles thereafter. The pre 2016 box is more fragile than the post 2016 but the advice is the same. The price you have been quoted is a very good price. Many pay near £400, so my advice would be get it done now because if it fails it's a £4000 bill for a new gearbox.