I started a thread on COL on lungworm yesterday, having been told it's an increasing problem in the area where I live (Romsey, Hampshire) and also in the south east of England, parts of the west country and parts of Wales.
I've done a Google search and so far the only wormer that I've come across that treats lungworm as well as roundworm and tapeworm is Panacur liquid (not tablets or granules). So I'm going to phone my vet and ask for advice.
Your'e right about the number of different worm treatments. I find it confusing.