why are you fitting your own boiler and heating system when you don't know what your doing?
pay someone to do it properly
will save you a lot of money in the future as your work will need ripping out and re-doing
who is gonna do your gas pipe?
are you gase safe reg?
you can buy the washers for the phx for around a tenner
not sure what u mean regarding air top up valve
auto air vent?
have u bled all the rads?
have you unblocked the exp vess flexi pipe?