Having grown up enmeshed in metric and imperial both measurements come naturally to me (except Fahrenheit, with freezing point of water at 32o and boiling point at 212o I still find it difficult to visualise, and altitude of aircraft which I still find im
possible to visualise in meters, but as the international standard for aircraft height is Feet I think I’m OK there). So I have slipped into the lazy habit of interchanging meters and feet, miles and kilometres in the stories. This inconsistency is wrong and I am in th
e process of turning everything into Imperial but it is taking time so… I apologise to the readers for the inconvenience.

 These are approximate conversions 
1 inch ~ 2.5 cm 
1 yard ~ 1 meter 
1 mile ~ 1.6 kilometres