Oliver,
I went to Dorrington Fen today (Sat) 2.00 - 3.30pm, parking up by the Dorrington Dike. I had to wait quite a time for the SEOs to appear - one, in very good light, at 3.05 (and then it flew up and down most of the time until I left at 3.30), and a second bird showed at 3.15. In addition, there were 2 Buzzards around the Dike area and then a third (on the way home to BBH) towards Dorrington village.
It's just a suggestion but I think you need to change your tactics re connecting with SEOs. Your hit rate is very low and I firmly believe that instead of driving miles and miles (eg. 145 miles yesterday), you would have more success if you concentrated on just ONE site for a couple of hours or so. Along with a number of other LBC members, I've had success at 5 different sites in the last couple of months - Dorrington Fen, Grantham, Dunsby Fen, Wasps Nest and Nocton Fen. In every case it was just one site only visited, usually between 1 and 2 and a half hours spent there and usually in the c 2.15 - 4.30pm time bracket.
Of course, you can be at a particular site one day and up to 5 SEOs show well; another day, at the same site, you may just have 1 SEO for a couple of minutes, sometimes none at all.........but that's SEO-watching. However, driving from site to site is not recommended, especially as there is then always the temptation to owl watch from the moving car, driving solo, with fen potholes, the occasional Sugarbeet lump....and those roadside ditches and dykes are ever really close !
If, for example, on 14th January instead of driving through Dorrington Fen to Timberland and back (2.00 - 4.00pm) (Your LBC post of 14 Jan) you had parked up for those 2 hours at Dorrington Fen Dike you would have enjoyed up to 5 SEOs from 2.50 - 3.45pm, as seen by myself and others including local birder Derek Pell. The next day both David Morison and Trevor Gunby had further views of up to 3 SEOs in roughly the same time bracket.
Perhaps other members may wish to add some advice as I think it's a shame that you put in the hours and the miles from Norton Disney without any real success to date.
Freddy
PS. If you want to visit a real Lincs SEO hotspot, it's Worlaby Carrs, eg. based at the bridge area and nearby at MAP REF TA 002 132 (Ord Survey Sheet 112). Admittedly, it's a good hour's drive from Norton Disney but only yesterday (2.00 - 4.20pm) even in poor light/weather conditions) Terry Whalin had 6/7 SEOs.( see his LBC post dated Jan 27th).
Good Luck, Oliver. I hope my post has been of some help.....it's only a matter of time, I'm sure. I look forward to your (good) news.  
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. Finally rewarded at Martin fen where i got good views, albeit in abysmal light, of a single SEO hunting the dykes and margins.