In one scene there are some vehicular anachronisms, this film is set in 1997, but in the background you can see a W220 Mercedes S-Class, a 1999 Nissan Primera, a 2001 Toyota RAV4 and an MG ZT. This is also noted in the goofs section on the film's IMDB page.
I can see how you might think that, but IMHO it's too wide for a ZR. The Rover 75/MG ZT body tapers quite sharply from the rear wheel arch, making the rear part invisible from this angle.
That's what I thought, otherwise it does look like it could be either car. IMDB lists it as a ZT in the goofs section, it's probably easier to see what it is on a big screen.