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co-ordinates in the top right corner are 6 figure National Grid
To convert them to 5 figure co-ordinates take the first EAST: digit and the first NORTH: digit.
In the Swaledale area they will be one of four combinations: 35 = NY 45=NZ 34 = SD 44 = SE
These four 100km squares meet 1km east of Surrender Bridge.
Example Reeth: EAST: 403853 NORTH: 499279 = SE 03853 99279
Example Langthwaite Bridge: EAST: 400533 NORTH: 502453 = NZ 00533 02453