Not in the UK but tis on mainland Europe. You'll need a trailer. Our EU friends have banned it on the grounds that the braking system can't be operated therefore it is an overweight unbraked trailer.
From the Caravan Club website technical section...
7. Towing
Q Can I tow a small car behind my motor caravan?
A In the UK, although the law is a somewhat grey area on this, it appears it is acceptable to tow a car not weighing more than 750kg gross vehicle weight, which includes the weight of an unbraked A-frame. As far as the Continent is concerned, however, the majority of countries said that members of the public caught towing with an A-frame would be taken off the road. Therefore in all circumstances the Club recommends that vehicles are towed on a braked trailer which takes all four wheels of the car off the ground.
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