Hi Reg and Pat - Save yourselves the labour charge by taking one of the bulbs to your nearest B&Q and asking for a lower wattage as previously mentioned.
If they're 50w GU10 bulbs you can buy 35w and 20w
If they're ses (small edison screw) spots, you can have 25w
Finally, if you local B&Q is in Durham, you'll find the lightbulbs in aisle 22 - tell them Rob sent you!
Let there be light - Lada