I've had the same problem with the telescopic slider as mentioned above by gadgee. B-Max is not the only Ford to suffer with this problem.
So, if you can feel through the steering wheel a very slight 'knock', and it is very slight, during walking pace manoeuvring, the slider needs greasing.
It's a piece of cake, the top steering column cowl behind the steering wheel just pulls off. Unlock the column adjustment and pull the colunm towards you. Use a torch to clearly see the adjuster and smear it in lithium grease. Job done in 5 mins.
B-Max Titanium 1.0 125bhp manual City Pack.