I was in the car yesterday and heard travel news from BBC Wiltshire cut in on the radio, and I heard a new jingle for the station!
The change in package is due to a change of the name: from BBC Radio Swindon/BBC Radio Wiltshire to BBC Wiltshire.
I've just been listening again and they sound like S2Blue's work, similar to BBC Essex's package.
More about the name change is at http://www.bbc.co.uk/wiltshire/content/articles/2009/04/06/station_name_change_feature.shtml
There's also an audio file called “BBC Wiltshire – the naming of a jingle”.