However, even though Kwik-Fit could legally sell insurance on a 'package only' basis, this isn't what their paperwork says they do. I use Kwik-Fit myself and I know that their prices are among the lowest (so I won't simply suggest that you go elsewhere). If you speak to Kwik Fit again, I suggest that you insist on being given the name of the person you're speaking to and that you make a note of the date and time of your call. Then very clearly state that you're only interested in TPFT cover and that you do not wish to pay for any additional cover unless it's compulsory.
Hopefully, you'll be allowed to just purchase TPFT cover. If not, accept the 'compulsory' package and wait until your paperwork arrives. You'll then see that the legal expenses cover is described as 'optional' and that you have 14 days to notify Kwik-Fit of any errors or alterations. At this point, you phone Kwik-Fit and demand that they remove the cover, refund you the money they've taken under false pretences (because you were told that it was compulsory) and pay you some compensation for the inconvenience of having to get it sorted out. With a bit of pressure from you, you should end up with just TPFT cover and at a price rather lower (say by 20 quid or so) than you were first quoted ;-)
Chris