I can almost guarantee I will not be wearing it on more occasions in the future. I looked at M&S and with those prices they can dooooooooooooooo one.
Even the cheap (£79) Next suits look decent, I had one and it really did the job for as long as it lasted. http://www.next.co.uk/men/tailoring/tailoring-essential/1
You will use it again at some point.