Cook the pasta according to the packet instructions, then rinse it under cold water. Drain well in a sieve.
Meanwhile, mix the ingredients for the dressing and season with salt and freshly ground pepper - and, if needed, more BBQ sauce, lemon juice or a little sugar.
Put the pasta, chicken, vegetables and beans in a bowl - pour over the dressing and toss well.
Finally fold in the parsley and season with salt and freshly ground pepper.