I've been given the impression that the client would quite like to take me on full-time, but I feel it would be underhand to turn my back on my current employer and walk off with a client. Am I being unnecessarily cautious?
A: Just having the 'impression' that your client would 'quite like to take you on' is not nearly enough. But if they formally offer you the job - and it's more attractive than your current job - you should take it. Losing partners to clients is an occupational hazard for consultancy firms; they neither preach nor expect sentimentality.