British Made and British owned, so if you have a family car, what will you replace it with?
Nearer to home - you need a new vacuum cleaner - Dyson would be the obvious choice, except that he's shifted production to Malaysia, so that's no good.
Is your hobby sewing? We don't make sewing machines in the UK any more, and increasingly they are not made even in the rest of Europe.
BTW I am old enough to remember the I'm backing Britain campaign. Note that it was before we went into the Common Market, which with its successor EU is supposed to be the source of all our ills, so why was there a campaign? We subsequently discussed why it had gone wrong in an A level economics class. Poor productivity was to blame from what I now recall.