I will draw your attention to one point of clarification. When the luring offence was brought in, the difficulty was in trying to have enough evidence before the actual contact offence was committed. That was the difficulty with arguing section 152 as an attempt, because you had to show more than mere preparation. That was one of the things the new offence tried to get at.
In terms of harmonization, what section 172.1 did when it was enacted was set a maximum penalty of five years on indictment. It was basically seen as half of the substantive offences, seen as an attempt. If it's more akin to an attempt of an offence, an attempt typically attracts a penalty that's half of the maximum of the actual offence, so that was the rationale behind it at the time.
If you looked at the listed offences, sections 151 and 152 had a maximum on indictment of 10 years. Section 153 had a maximum of five years. It was only increased to 10 in the last Parliament. The abduction offence, section 280, has a maximum of five years on indictment.
You can see there was a bit of a range there, but as I say, the parliamentary record would show that the comparison was really to an attempt provision. It was to enable the system to deal with that front-end part of the process before the actual contact offence.