My late father shows in his timeline in the back of his log book that I do not recognise. He had been a WOM/AG with 240 squadron at Redhills Lake, Madras from July 1944 until October 1945.

He then shows 4 SP, Jiwani from November to April when he set off home and release.

My question is what was 4 SP? I have tried searches with no useful returns. I thought SP may be Signal Post or Party any help would be greatly appreciated.