The staging of the Aintree Grand National sees the team working flat-out trying to get two new police motorbikes converted in time. Second-in-command Tony finds himself on the wrong end of a 4x4 challenge.

Police officers request a new police support unit or riot van, while a stolen car chase ends with an X5 wedged in a hedge. Boss Mick Sweetmore goes back to the floor with Merseyside's mental health team and discovers another side to modern-day policing - as well as the poor state of the vehicle they are currently using.

The workshop struggles to convert three quad bikes into frontline police vehicles, while an officer has to crash a pursuit car to protect the public. Steve wants to share his home-made birthday cake - if only he can persuade someone to eat it.

Mick puts in an order for 20 new beat cars just as the workshop is full of damaged ones, including one an officer was lucky to walk away from with his life. Joe is on the hunt for a new job and not everyone will try out Tony's raw food diet.

The team sets out to design and build an all seeing 360 degree camera car. A frontline X5 with a serious mechanical failure is needed urgently back out on the front line, and the cops encounter a cuddly criminal and a hungry speed-demon.

Mick Sweetmore's team need to fix a radio issue to keep the new pursuit cars on the tail of Merseyside's criminals, while there's a surprise visit from the fleet's oldest member.

Emergency surgery is needed when a new prisoner van gets on the wrong side of a rooftop protestor.