How could they have amassed 5% in such a short time in...

How could they have amassed 5% in such a short time in comparison to the last 6 months? Is it not a case of; (a) they had warehoused a shitload of shares or (b) they had private discussions with a large minority shareholder and worked out some kind of under the table deal to get them to tip into the offer. I think option (b) seems more likely .

Does selling my shares on market or accepting the offer preclude me from any kind of recourse down the track?

And to a previous poster; it was the first thing I thought of too when I saw the picture of Colin Patterson - He really does look like a dodgy crook!