How do I re light my pilot light on my back combined 80e?

Your boiler is very probably a Baxi Combi (combination) 80e

On modern boilers the pilot light comes on when there's a call for heat - then - when a sensor determines that the pilot flame is good -the main gas valve is opened.

If your boiler has no pilot flame when you ask for heating or hot water you would do best to call in a specialist engineer.

Good Luck...
October 2016