Grant outside oil Combi wont fire up?

it would be nice to know the following
boiler make & model
gas council number [if possible]
do you have the boiler manual?
it should have the filling system pressure procedure in there
if not can you access manual from manufacturers website?
if you have never topped up the pressure before & are unsure you can look at the following guide
youtube
how to top up pressure

manwithnoname
April 2012