Locating Bleed Valve on burner

OrientSeb

So I have oil fired heating/hot water, recently my tank split, had some oil left in and powered up the boiler and it was working fine, now have a temporary tank fitted and due oil tomorrow, will I need to bleed the burner before powering up or will I only know when I try and boot it up? The other issue I've had is I've looked for the bleed valve/nut/screw and can't locate it, it's a Bentone Electro Oil AB (I believe that's the model), anyone have much experience with this burner?