The Union Jack is IMO essential to the design but having it as the logo doesn't make the logo individual enough, i.e. skippi whilst your design is really good the UJ could apply to anyone or anything. This is why I think just elements of the flag should be incorporated to produce a unique and identifiable design that people could recognise as being associate dto OcUK. I'm not sure that makes sense but imagine if Morrisons, Apple, Adidas, McDonalds, etc made their logo with a union jack covering it, the individual identity of the logo would be lost