Thanks @tarka_the_rotter but it’s next year I’m looking for a marathon.

@downshep – that seems to be the consensus regarding the Edinburgh route . I am in it for the PB so I’d like a relatively nice route but equally I can live with some sh1tty sections

Boston UK has just been (14th April?).
I did it last year and it is flat, very flat, and I got a PB so ticks the spring and PB options.
It is though pretty dull, but if you’re after a PB then it’s a good course with that in mind.

Manchester is pretty flat too, not as flat as Boston though.
Manchester is much bigger and Boston is much smaller so it depends whether you want to go low key or big event?
Best thing to do is have a look on run Britain for events that have just happened or are about to and see what floats your boat.

A couple of left-field options, both of marathon distance but with scenery:
Lairig Ghru race, June.
Braemar to Aviemore, straight through the middle of the Cairngorms and very well managed.

Glencoe marathon in September.
Marathon distance from Glencoe village to Glen Nevis campsite near Ft William, much of it on the West Highland Way; again highly regarded.

Both have lumpy bits in them and harder surfaces than your average high street. The terrain, the company and the views are superb.