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I am on the look out for second hand lightweight Bivy's though, but must be circa. 200g.
Alan- I believe we have a mutual friend- Was lunching with Janet Donnely on Monday- small world!
Taking a lightweight bivi instead of your inner will only save you the weight of a pack of butter... I think I would take the inner and no bivi, but that's a personal thing - I wouldn't resent the extra weight for the additional midge and warmth benefits.
Give my love to Janet - she's a wonderful girl!
In my experience, mesh won't give adequate protection from the mist produced from condensation and it makes sense to take some kind of bivy bag protection. Unfortunately the RAB ultra doesn't seem to be available, nor the equally light Equinox bivy bag. It's probably too late to order anything from MLD. 
Addendum: the RAB Suvival Zone Lite weighs 236g and might be worth a look http://www.ultralightoutdoorgear.co.uk/rab_survival_zone_lite,_ultralight_bivi_bag.html