As a permanent member of the UN Security Council the UK can call for a ceasefire and the release of all hostages.

I read they used motorised paragliders to cross over the border fence. The vans may have been captured afterwards. But this is my guess and I have no idea if there were forces that managed to overpower israeli forces controlling checkpoints.

It became very popular in Egypt few years ago. Kids called it Sisi's balls, which angered the authorities that tried to crack down on its sale.
https://www.al-monitor.com/originals/2017/11/sisis-balls-gets-confiscated-by-egyptian-police.html