I broke my rule painting the dog on the right from memory / imagination, was not impressed use a photo reference for the spaniel effect, vast improvement so repeated
reference
There was at least one reference to the hoverbot as they ran up stairs thinking they had outrun them they turned in horror and saw them floating up, and I think there was an embassy flight one time, but I agree with the snow and tractionI have this authoritative information from the official BBC book about the Daleks, as developed on Skaro; that their plans for universal domination were initially thwarted by such inconveniences as stairs, and ice or snow on the ground which led to traction difficulties. This was overcome by the 'Hovabout' which made them able to fly, and would eventually be fully integrated into the Dalek machine, final design pending.
Sadly, my Ma long ago donated this invaluable reference paperback to our local Hospital's children's ward, and the BBC must be assumed to have lost their copy, as their frequent regurgitations of the Daleks show no sign of the upgrades that were to come...