As an ex-bodyshop manager may i suggest the following:- If you get you finger nail and GENTLY pull nail accross the "scratches either you nail will feel a DEFINED ridge ( normally you may see a white/grey undercoat)and therefore you will need a proper paint job ,If the are small genuine scratchs I have used Dent Devils/or similar type of these companies opporate all over the UK but if you cannot feel this ridge (scratch mark) it may just need to be buffed out . This is the cheapest course.