RISHI SUNAK’S Rwanda deportation scheme costs could soar to half a billion pounds, plus hundreds of thousands more for each deportee, an investigation by the public spending watchdog found today.

The Home Office has refused to say how much more money, on top of the £290 million already confirmed, Britain has agreed to pay Kigali under the stalled plan.

But a National Audit Office (NAO) report revealed millions more in spending today — including £11,000 for each migrant’s plane ticket.