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When disconnecting the line from the pump to the nozzle tube should that be pressurised when the system is off (mine is) which is why I suspected the check valve

Yes would also serve as a back up should the solinoid valve fail open. I would be reluctant to throw a part that has been specified by a fluid mechanics and combustion engineer at worcester. I am sure if they could increace profit by removing it would have been at the production line

There really is a valve behind the nozzle its part of the service to remove and inspect. A small inline valve about a cm long removed using a screw As per : http://www.heating-parts.co.uk/product.asp?prd=200458

The check valve behind the nozzle. A one way valve. No I am slackening the line that feeds to the nozzle after being through the pump to get it going.

It has a bentone box. It appears to go like this when working. Non tecnical : Air blower and oil pump prime 5 sec Click open oil valve With in a second catches Now broken verson sometimes does not restart as oil does not over come check valve. If I loosen the line allow a little...

As said, not touched any of the oil pressure settings or air settings (nor plan to). If the settings were all correct before should they have changed?

My boiler keeps tripping out. Attempts so far: I have just cleaned and serviced the main parts inc replace nozzle as per manual. I have found the problem to the tripping out oil is not getting to the nozzle reliably. Only way to get the boil to fire up is to loosen the connection to...