Helen put a question to the Prime Minister in this week's PMQs ahead of this month's EU referendum.
"With industrialists such as GlaxoSmithKline and Hitachi warning that if we left the EU, jobs would be lost, the Brexit economist Patrick Minford has revealed that under his side’s strategy, manufacturing would be mostly eliminated. Will the Prime Minister join me in calling on the Brexit leaders to say how many other people’s jobs they would sacrifice on the altar of their own political ambitions?
Mr Cameron answered:
"The hon. Lady makes an important point, which is that one of the reasons why international companies such as Hitachi invest in Britain - of course, we also have excellent labour relations, the English language, and a very hard-working workforce and great engineers - is that we are members of the single market. I thought that what the head of Hitachi said this week about wanting us to be the European headquarters, and to manufacture those trains in the north-east and sell them all over Europe, and how that might not be possible if we were to leave, was an incredibly powerful statement. In my clear view, jobs come first, and if people want to vote for jobs, they should vote for remain on 23 June."
You can watch the exchange on parliament.tv.