Exactly, they're not going to pull you on a box of badges, they're more interested in tobacco and alcohol and other high vat items.
I think it's £390 per person and then 2.5% but they only bother charging you if the duty payable is over £9 which is another £360 +/- a little because about it totals £630 duty will increase to 4.5% for car stuff.
My head hurts