Cycling looks good because a bike was his cottage and cycling adds more emphasis to a prosecution narrative " he went via cycle to be quiet and not be seen. Using the sea wall. Which one paper looks good because it's apparently a desolate track.
I think the truth is if gulity is he simply jumped in the car. The area was desolate and the houses he would encounter were set back. There's little risk in driving in itself. The biggest risk of driving is not been seen or heard but the car breaking down on the return journey to his cottage. As said if thst happened he would have been well and truly been up shit creek without a paddle. However the odds of that happening were probably slim, the astra car was pretty much brand new and probably well maintained. He later went to meet the police in the car without been seen. Bews remarking that Bambers car was the only one he saw.
He can if he wants to be extra cautious. Park half way down pages lane ( out of sight of farmworkers houses ) and simply saunter down to WHF. Do what he did. Leave the farmhouse get back in the car and return home.
I don't think Bamber was a guy who had much care about " risk " if anything he is rash, impulsive and risk taker. A man who can carry out of what he is convicted of is a large risk taker in itself. In the aftermath of the event he didn't even bother to act ( if he is gulity ) like a Bereaved relative, selling stuff, smuggling drugs, attempting to sell pictures of Shelia, mocking the coppers with his Hugo boss suit label. The guy if gulity told his girlfriend what he did and expected she would never breathe a word to anyone!