Posted: 05/05/2013 at 21:45
My thoughts are that as sometimes happens the grower ( which won't be Tesco) has dug these up from the field in which they were grown and potted them in a pot reasonably suited to their size. That explains the 2 types of soil. This happened fairly recently so there hasn't been much time for the roots to get stuck into the potting compost. Whilst this may not be ideal the do look healthy specimens and I can see why you were happy to buy them.
I would leave them in the current size pots to give them chance to get rooting.Keep them out of direct sunlight and keep watered but not waterlogged. Perhaps the occasional weak feed of Tomorite or similar, something that will encourage root growth rather than leaves. Have a fresh look in late summer/early autumn and if they look healthy and are growing strong roots then repot onwards.
Have faith... they are nice plants, and tough as old boots.