Thanks for the replies guys...
Having thought about it I'm not going with the Security film, looks quite limited in it's usefulness & even a couple of tinting companies have told me not to bother, even though they could have made some cash out of me.
Unfortunately my insuarnce only covers ICE up to £1250 although I think if it ever got stolen I'd go with something aftermarket anyway, preferably with better unit security (removable panel etc)
One thing I have considered is using the fascia from a basic VW OEM unit as a "dummy cover", might just work?
simon