Struggling to get back to fitness

Been riding some more since getting back from holiday. I have managed to cycle Saturday and Sunday on both weekends since we got back and got a commute in this last week but still finding it incredibly hard work. After 40 miles Sunday last week (15 July) I was pretty well blown. Over the last 2-3 miles I was riding it home on the 34 inner ring which is desperate in reality!

I am trying to get more miles in and make the best use of them but I can see it being months away to match the level of fitness I had at the middle of June

Oh - and I got another of these: 

But I have gained another KOM in Coventry on my commute: