Chimney Job - is this a good quote?

Hi,

Last week a neighbor pointed out that a brick had fallen from my chimney (from the 4th row down) and was sitting on my roof. I moved into this house last year and the survey stated that the chimney needed attention.

I've had a quote through today (and while he was here he removed the brick for me, save it smashing through the conservatory).

The brick has smashed a couple of tiles where it had landed. He inspected the chimney and concluded that 1 side needs rebuilding. He said from above the chimney has swelled, and I can see indications of this from below. He suggested that the strap holding the aerial to the chimney may also be what's currently holding the chimney together :eek:

The quote to re-build the side with the missing brick, re-point the chimney for me and neighbour, and do the flaunching (he show me a picture he took whilst he was up there - it's knackered) would be £700 + VaT. I'm in the midlands and it's a bog-standard chimney stack.

Does this seem fair? He's willing to get some people out on Thursday to sort it for me as I am now 2 tiles short on the roof and have a chimney with a hole in it. I've tried 4 others and they're all booked up.

Thanks

Ben