Bats in the belfry, windows are jammed - London flat renting, deposits & landlords

An update has come, this is the reply I've just received:

My sincere apologies.

The email I sent you requesting a move-out in two weeks was a mistake.

At first when I began reading your email I couldn't understand your
email at first. Then I had a look back at what I'd said.

No, clearly two weeks is obviously not an acceptable time frame. This
was a genuine mistake which occurred whilst looking at the wrong month
on my laptop calendar. I hope you'll accept my apologies for the undue
stress caused to you upon reading that.

The actual date I had intended to reference was the last Friday of
July, being midday on the 29th of July as the final move-out date.

The property being vacated on this day is not ideal and the day before
would be better to allow time for a change over, but as I had
mentioned in my previous email, it's common for people to want to move
on a Friday - the prospective buyers would like to pick up keys on the
Friday afternoon and I was prepared to include this day incase you
also had this preference.

Could you please confirm you are in agreement with a move out date of
July 29th.

Would you also provide your partners surname please as the purchasers
solicitors require that information and my solicitors may also be
required to get a signature from both you and your partner that you are aware
of the Sale and confirming it will be vacated by the given date.

Regarding the check out report, I could look back at the file although
I'm sure your right when you say that the lettings agents made a mess of
the check-in and I believe that was also one of the reasons I chose to
dispense with their services too.

I won't therefore be booking an inventory clerk-although I had not
intended to in any case-and will arrange for someone to visit the
property as you move out or immediately after you have vacated your
possessions.

Its starting to feel like a joke. So far we've gone from two weeks notice, to now six weeks. Although, I'm not sure what's happened to the two months stated in the contract?