On 25 Jul, 14:58, mike wrote:
Just read in a DIY manual that an outside tap should be installed "at
least 250mm above DPC level".

Why? What would be the dire consequences of installing below DPC...
apart from not getting a bucket under it if the DPC were six inches
above ground level?

On a sloping site with the DPC well above ground level, the tap could
be quite high up the wall if you position above DPC.

Makes no sense. What if you had a cellar below DPC. No tap allowed ?
As you say, sloping site, sloping oversite/subfloor, many rows of blue
bricks up to DPC in back garden etc, no reason not to have a tap
within reach of the ground. As long as it it properly insulated.
Simon.