I agree with Fran. I watched it on sunday, but owing to spending four hours quality time in the pub on sunday pm and finding the spectacle of Jeremy's "boat" turning turtle hilarious, I decided it wasn't fair to offer an opinion. 
However, I watched the repeat last night (entirely sober) and the utter childishness of it had me in stitches yet again. Agreed, not too much on proper cars, but I disagree that Philip Glennister is an unknown actor.
In their defence, I think the TG team have some problems with the council with the granting of planning consent for use of the studio. So that could be having a reducing effect on how many "from studio" items they can film.