So the details of my LSR.
Plan was 15 miles 9:15 to 9:30 pace and the last 5 at MP (8:30).
I took a different route today to try and eliminate some of the hills and to stay away from busy high streets.
I covered the first 15 miles with an average pace of 9:18 min/mile. 7 of the 15 miles were slower than this and 8 faster. Some of the slower miles was due to the hills / inclines, some due to road junctions / traffic lights and 1/2 because my mind wandered.
Took on some jelly tots after mile 14 getting ready for 5 miles of MP.
Cannot say that these were easy. The last 2 miles of the 5 were uphill - not steep but you felt it in the legs and I also had to negotiate a busy road junction.
It took a little while as I kicked into the MP session to get the legs moving. Initially it felt that they were stuck in the slow motion that goes with LSR running. But I did get them going.
The last 5 miles were as follows :
8:12 min
7:57 min (where did this come from ?)
8:11 min
8:37 min (incline and road junction)
8:21 min
Overall time for 20 miles was 3:00:48.
I was wondering the whole way round how I was going to do 5 miles at MP to finish off but somehow I did and I am really pleased but tired. 
It will be interesting to see how I feel in the morning. Have got to take my little fella to his footie match so will probably go for a recovery run in the afternoon.
How long should a recovery run be ? 4 or 6 miles ?