yes, you can mine other sha-256 coins.
but for 150 pounds you can't earn anything. I mean you can start mining with some usb erupters and play a little bit but you will not earn anything.
If 150 pounds is all you are willing to invest then forget about it.
take your wife to a nice dinner, buy her some sexy laundry... it will be much more fun then invest in some worthless mining gear.