What Are My Rights Buying a Car 2nd Hand from an Independant Dealer?

last week i bought a v reg scenic from a garage (it was a p/ex to clear for him) and i have since discovered that the rear wiper does not work. he gave me a 6 month warranty (car care or something) but i have phoned them and the rear wiper is not covered by this. what are my rights in terms of getting this mended? it is worth pointing out that the garage is not exactly on my doorstep

Suggestion:

Lemon law is USA and this is a UK question.
You have the protection of the UK consumer law when buying from any dealer. A dealer describing a car as trade, part ex to clear or sold as seen does not get them out of their obligations in law which will remain the same.
If the wiper stopped working after you bought the car, bearing in mind it is a very old car, then the dealer would ot be responsible. If it was not working when you bought it and you failed to find it on inspection then it is going to be your problem as there is no way to prove it has not just gone wrong today.

When buying a car of that age it must still be suitable for purpose but you have to know that at that age it is not unreasonable to expect little things like this to occur soon after purchase.

In a nutshell you will have to get it done yourself. It is not unusual for such an item not to be covered by a used car warranty.