Hi there,
I remember this in the competition, and I think it won a deserved Gold. Well done indeed.
I use Winsor and Newton water mixable oils. You can use them as a conventional acrylic, but they take a bit more time to dry, so you have time to blend and smooth just like conventional oil.
They also clean with water, so you don't need turps. On saying this, they can be mixed with conventional oils ( more in the colour range ) but then you will need spirit to clean them!!
I am pleased you enjoy painting flats, they are quite compulsive, and the range of subjects are vast.
I welcome you here, and should you need advice just ask, there are many here ready to help.
Be wary of the cast shadow adviser though ( Eric ) he's a bit dodgy to say the least!!!!
Nick