The washer (from what I can remember) is one of those kind of fibre ones (like a very thin kind of gasket).
I suppose the only difference it would make it that without a good seal between it and the plenum chamber is that air could get in/out as could small dust particles maybe.
They're not expensive at all so you might as well get one (or a packet of 5 I think is the smallest quantity I ever found) and put it on.
2012 Discovery 4 SDV6 HSE
2003 Discovery 2 TD5
2003 Defender Xtreme
1997 Discovery V8i
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