Likewise what Mark said. The D2 fills fine like that. Give the bleed screws a squirt of WD40 before you undo them and use a nice big screwdriver that is a good fit in the slot.
Also I'd recommend replacing the four rubber bushes which support the radiator. By now they're probably seized in place so you'll likely destroy them getting them out, and they'll be getting a bit soggy anyway. Upper two are 441121273L, lower two are 441121273K. Etka says about £15 each, although I think the upper supersedes to a cheaper version.
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