Its also worth looking at the volume data versus buyback data...

Its also worth looking at the volume data versus buyback data recently:

	Column 1	Column 2	Column 3	Column 4
0	Data	Vol	BuyBack	%
1	22/9	88,153	?	?
2	21/9	153,793
3	20/9	138,686	25,000	18%
4	19/9	87,620	25,000	26%
5	18/9	261,337
6	15/9	96,334	40,000	42%
7	14/9	284,970	50,000	18%

It doesn't look like (to me) buyback is causing the recent price rise.  There are lot of people in the market and since the price is rising there must be more buyers than sellers.  Perhaps its the approaching dividend ex-date or perhaps the big holders are accumulating.