Ming;
1) You might be able to buy for 90p it depends how much dumping there is tomorrow by placing institutions/other investors looking to topslice for a quick return. Like I did with 3/4 of my 10000 T25 this am, leaving 2500 shares in for free. I'll join you for 10000 below 90p.
2) Oil and gas is very risky. Things like dry holes, poor permeability/porosity on flow testing, then political risk. And FSU is tiger country. Lots of things CAN go wrong, even in UK e.g Brown's N sea tax hike.
3) 3m 180p 6m 260p 9m 400p 12m 600p, but not in a straight line.
Good luck with your purchases.