Ignition key

Ive just noticed that Ive lost the "lock" button off one of my ignition keys - its seemingly fallen off or got broken, still got the spare working properly but what I need to know is can I get a replacement button or indeed key casing or is the whole thing gonna need to be replaced?
Anyone suffered this issue before?

Search eBay "discovery 2 key casing" looks as if there's one or two there.

discool said:

Search eBay "discovery 2 key casing" looks as if there's one or two there.

Click to expand...

Thanks, replacement ordered, £3.07 - cheap easy fix