I dunno about Martins but there's Swallows still here.

I'm just back from walking round the lake and two Swallows were swooping around, catching their dinner I guess?

Our Martins have all gone...they went on the 22nd Sept. I wonder if they knew it was the Equinox!! They were getting fewer and fewer each day, unail the last day, when there were about 4 or 5 left, and then they went...that was the last day I saw them. I feel a bit sad that they are gone, but all being well they will be back next year.