(At around 14 minutes) When Neil says he will probably go to university, Will is facing him. The following closeup of Will shows him facing forward whilst talking, and in the next shot he is facing Neil again, before turning around looking towards Simon and Tara.
When the group arrive in Warwick, the house is an end terrace with a street sign on the side wall. The street sign, whilst blurry, does not match the style of street sign for Warwick. Instead, the street sign is in the same style as London streets, as is the architecture of the house.
The road they are driving on to Warwick is only a two lane dual carriageway with no hard shoulder. If they are heading from West London to Warwick, they would use either the M1 or M40 which have three lanes.
The road is similar to that they drove down to Camber Sands and also returning from Gillingham after Jay crashes Neil's motorbike.