I know day time running lights are mounted under the head lights or under the main section of the bumper on cars but what I want to know is could you mount them where the cab marker lights would be on a transit type tipper and be legal?

Positional requirements are as follows:

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6.19.4. Position
6.19.4.1. In width: the distance between the inner edges of the apparent surfaces in the direction of the reference axes shall not be less than 600 mm.
This distance may be reduced to 400 mm where the overall width of the vehicle is less than 1,300 mm.
6.19.4.2. In height: above the ground not less than 250 mm nor more than 1,500 mm.
6.19.4.3. In length: at the front of the vehicle. This requirement shall be deemed to be satisfied if the light emitted does not cause discomfort to the driver either directly, or indirectly through the devices for indirect vision and/or other reflecting surfaces of the vehicle.

6.19.5. Geometric visibility
Horizontal: outwards 20° and inwards 20°. Vertical: upwards 10° and downwards 10°.

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