Thanks for such a fast response, I won't get up early now to head off to the dealer.
The movement is only very slight, a fraction of a degree, hence not noticing it before. As for the noise at the end as it cleans the sensor now makes perfect sense and again not sure why I didn't notice it before. I think I'm getting over cautious as a couple of items I bought over the last year have not lived up to the quality they should have.
Thanks for the welcome Clive. I've been monitoring the site for sometime, long before buying my A77 and hopefully will soon be a contributor rather than someone that just asks questions. Sorry to read about your own issues, hope they get resolved to your satisfaction soon.