Checking Soldier of Fortune's site, they don't include Airsoft Skirmishers as permitted buyers of Denix replicas.
Unfortunately, it is up the Seller's discretion if they'll sell a non-airsoft replica gun to an Airsoft skirmisher at the end of the day. - I guess he's of the opinion a Denix dummy replica wouldn't be of any use for airsoft skirmishing.
I'm assuming that your BAC skirmish card is for an approved skirmish site with Public Liability Insurance? Does it have an UKARA number?
If it does, have a good search around for another Denix retailer who'll include Airsoft skirmishers in the full list of VCRA exemptions.
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Cerwyn
Hobby collector of Replica model guns and Militaria.
also member of Living History Reenactment Groups.