Well, it seems that you have two choices. Either you do as they suggest, and drive around with it banging away until whatever is causing it is hanging off, or find a decent independent garage, explain the situation, let them have a drive, point the noise out, and see what they can do.
For something like this, you need someone who has been in the trade for a while and knows all the tricks to find obscure suspension faults. They may well suggest the other droplink without looking, just to rule it out, and I'm with Jocko on starting there.
As I said earlier, knocks and bangs can sometimes be tricky to pinpoint, but it can be done with a bit of patience. There is almost certainly no danger in "letting it develop", but these noises drive you nuts and become unnecessarily distracting - you end up driving about concentrating on the noises the car is making, rather than the far more important matter at hand.