For UK visitors whose entry are scrutinized and landing interview details recorded, including return flight date and airline etc, will departing earlier than stated on the landing card and via a different route cause any problem on subsequent visits?
Say your original departure was via a direct BA flight to the USA on the 24th of March however you end up leaving a few days earlier still via BA, on the 22nd to Germany for a two day stopover and then on to the USA on the 24th.
It is generally problematic when a visitor stays longer than planned and quite a few visa refusals here on travel stackexchange are because travelers changed their stated departure dates on a previous visit. The explanation is that such a person is viewed as fickle and/or not trustworthy by consular officers/IO's however does the same apply to those who leave a few days early? I would think departing early/on time is always a good thing.