Accountants!!!

I sent my accounts off in July to be done (we have rental property and a small/tiny business) and they still haven't been done. I emailed them months ago and they said the accounts were on a ten week turn around so would be about another 3 weeks, 5 weeks after that I emailed again and they apologised said that someone had been off sick and that they had been training (don't see as thats my problem but hey) and it shouldn't be much longer (that was on the 26th October), should I be pissed off cos I feel pissed off.

How hard is it to change accountants? and was is a reasonable amount of time to expect a tax return to be done in? They faffed us about last year, apparently they missed placed something and wrote a big apology about how they have updated their filing system etc so it wouldn't happen again.
I'm getting the distinct impression that because we are a small customer we are getting shafted.

Think I might ring around today and see if I can get a different one, perhaps they can even deal with getting the papers off of the current one.

Yes they are quite large, they were recommended to us

Have an appointment with an accountant on Wednesday, so hopefully when I tell them how annoyed I am with the other accountant they won't jerk me around