I have a Worcester Bosch 241 Boiler. The pilot light is out after being on holiday. How do I reset it? Thanks.?

Most appliances with a standing pilot have instructions on how to relight it. If not you usually have to put the gas valve on "pilot". Push the valve in and light the pilot. Hold the valve in for one minute so the thermocouple can warm up enough to produce it's own voltage to hold the pilot gas on by itself. Then turn the gas back t the on position. It should be just like a water heater. Your water heater directions should be very similar to the boiler if it also has a standing pilot system.