Sole in a cream and garlic sauce

The sauce was adapted from something in the Cafe Paradiso cookbook and involved an entire bulb of roast garlic reduced in white wine and cream- absolutely blinding. We did our shopping on-line this week as we've been really busy. One of the frustrating things about this is that you can't source where your food is coming from- so the sweet potatoes are probably from Argentina or Polynesia or the moon or somewhere.

Sole (Scotland)
Potatoes (home grown)
Sweet potatoes (unknown origin)
Greens (UK)
Cream (UK)
Garlic (Spain)
White wine (Australia)