I also googled it where I did find the SAR (RAF mountain rescue team their pet name for the yellow helicopter was a "Paraffin Budgie") and 748 mention plus this one, "Paraffin budgie (slang) Helicopter that serves an oilrig" on a North Sea oil site. Kind of covering all bases.
My friend called the G-LFBA helicopter (trials in 1995) the term as well.
Appreciate all the comments, interesting.
Richard