The Mccanns are on record for saying they are in it for the long haul. I don't recall Redwood saying anything like that, although the Home Office have apparently said time and money are not of the essence.
Closing in? What makes you think this? Four years they have been reviewing/investigating.If there was anything significant it will have hit our screens by now.
Not that it is important, but I have concluded that SY is nearer the start, not nearer the end. See my blog if you want details.
Here is the summary. SY activity in 2014.
March. Appeal re burglar assaulting white children.
June. Ground hunt around Luz.
July. Four arguidos, Sergey plus possible 'group of three'.
Oct. Trip to Coimbra to check on forensics route.
Dec. 10 people interviewed as witnesses in Faro. Potential connection covers every possibility going.
That lot is not end-game. It's 4 years in, but it is still looking like working through the basics.