Former MET officer, Ian Horrocks, with 30 years experience suggests a car may have been used.
Horrocks was second in command to Hamish Campbell on the Jill Dando case. Hamish Campbell was put in charge of Operstion Grange initially. Campbell was the one responsible for it's remit, which was to investigate an abduction.
He arrived in PdL in 2012, hired by The Sun. He wrote a report, but rewrote it in 2013 as new information was released. In his first report he was 100% sure that the McCanns weren't involved;
"in my opinion, the most salient fact is that a male was seen at 9.15pm carrying a child who clearly fits Madeleine’s description. When taking everything together this was clearly Madeleine, which therefore 100% rules out Mr and Mrs McCann as being involved in any way."
The above passage was removed when he rewrote his report because Redwood got rid of Tannerman.
I find myself in agreement with one passage;
"Although theories are of course a significant part of detective work, they should be based on evidence and not simply that you think you know what happened. The vital point is to keep an open mind and to go where the evidence leads, not where you think you want it to go."
https://www.gerrymccannsblogs.co.uk/Ian_Horrocks.htmIt's worth wondering if Horrocks was influenced by his connections or by his employers. OG under Campbell were investigating an abduction and The Sun have supported the McCanns.