kilwahang,
not sure how many we had on strength during my tour but there are 14 different frames recorded in my log book from that time. This of course does not mean we had 14 on strength as some may have replaced earlier a/c that were sent back to the UK. For example on 15 Jan 1971 we airtested XV179 and then on set off for the UK on 17 Jan via Gan, Muharraq, and Akrotiri. The captain was a F/O ! We all returned back to Changi on a VC10.