....get them to check their spare wheel aint been nicked.
Then get them to try to suss out a way of putting a chain and padlock on it.
Vauxhall have nothing sorted yet, BUT they are going walk abouts at a faster speed than even Peugeot spares did in late 1999 when it was discovered just how easy it was to steal them.
Be aware.....if you know someone with anymodel of Zafira, get them to sort it soon.....I am sure Vauxhall will have to make an option of some sort of Lock or Securing device..but until then, home made is the only way.
I dont like this kinda thing, but you might just save a neighbour/friend/realtive a lot of money and arse ache by just telling them.
Cheers