A trivial matter in the grand scheme of things of course but:
I first noticed this as a school boy "oop north" when a teacher from down south joined the staff and caused great hilarity by saying "drawrings" instead of "drawings".
It seems to be a southern phenomenon but not at all a type of chavspeak. Some of the worst offenders are media types who speak middle class "received" or "BBC" English.
It amounts to an inability to pronounce two successive vowel sounds without putting an "r" between.
A few examples I have heard in the radio, mainly over the past week or so:
West Brom managed a one-all drawragainst Aston Villa.
Planning the withdrawral from Afghanistan.
Chris Grayling is seeking a change in the lawron reasonable force against burglars.
The police are trying to restore Laura Norder.
And on Radio 4's "Poetry Please" in an otherwise moving reading of Oscar Wilde's "Ballad of Reading Jail":
"But I never sawraman who looked
So wistfully at the day.
I never sawraman who looked
With such a wistful eye."
Grrrrrrrrr!