The grid square convention 6

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 Within the 100 km by 100 km squares each smaller grid square (of 10 km, 1 km or 100 m side) is designated by the distance of its south-west corner from the west (eastings) and south (northings) margins, respectively, of the 100 km square in which it lies.
To enable these distances, or coordinates, to be easily found their values are printed in the map margins against the grid lines concerned. These provided the numbers – 2, 4 or 6 which identify each particular grid square.
A point or feature within one of the smallest grid squares can be indicated still more closely by estimating the tenths of the square.

 100 km square TQ grid intervals of 10 km precision 1000 metres full grid reference: TQ 3877 applicable to map scales: 1:625 000 (part of sheet 1 south); 1:250 000 (part of sheet 9)   

10 km square TQ 37 grid intervals of 1 km full grid reference: TQ 388 773 precision 100 metres applicable to map scales: 1:63 360 (part of sheet 171)*; 1:50 000 (part of sheets 176 and 177); 1:25 000 (sheet TQ 37); 1:10 560 (sheet TQ 37 NE)*; 1:10 000 (sheet TQ 37 NE) *withdrawn   

1 km square TQ 38 77 grid intervals of 100 m full grid reference: TQ 3885 7734 precision 10 metres applicable to map scales: 1:2500 (sheet TQ 38 77) 1:1250 (sheet TQ 3877 SE)
100 km square TQ in relation to the base 100 km grid.