I would have thought an unrepaired cleft lip and/or palate in a baby or child older than a few months must be vanishingly rare in the UK. I've certainly never encountered one, and I've worked in medical research in a related field.
I do sometimes semi-consciously spot repaired clefts in adults when out and about, and have to make myself not do a double-take to have a proper look at the detail of the repair. But even in older adults they are usually really very good indeed, so that you'd have to look twice to be sure of what it was, and techniques have been getting better over time as well.
Thinking about it, I don't think I have spotted even a repaired cleft in a child or baby recently, which means that either the folic acid advice has caused incidence to drop so much that there are very few even repaired clefts around, and/or the techniques have got so good that even someone with experience in the field wouldn't spot it on a casual walkpast.
If I won the lottery, Smiletrain would be right up there in the list of causes I'd want to donate to, because unrepaired clefts are so disabling (socially as much as practically) and disfiguring, and treatment is really very straightforward and completely life-changing.