I bought a single-element induction hob today at Aldi. My cast iron & enamelled steel pots & pans work with it nicely as does a pair of steel wok pans. I did buy two smaller 16 & 20 cm pots to suit it, the latter can use the stainless steel steamer (perforated bottom) pans for a bit more versatility.
Mighty impressed with its performance, especially as the price was so low.
I mentioned it to a few caravan owners, I reckon one would be very useful in a van.