Thought I'd link this article too, as it has a lot of quotes from the Prosecution. Peter Joyce says the couple lied and lied and lied to cover up the Wycherley's deaths in 1998, and drain all their assets:
'The Edwards...stole more than £173,000 from the Wycherleys' bank accounts, benefits and pensions after the killings.....In 2005.....made a further £66,000 from selling the Wycherleys' home..'
Police became involved through a combination of two things; The Centenarian society wanting to interview Mr Wycherley, which panicked the Edwards into fleeing to France then, once they were there, Christopher Edwards' stepmother having the good sense to contact the police when he (she says) confided in her he'd helped bury his wife's parents!
It seems this was part of his request for her to loan him some money?!.....Did he really think that would encourage her to say yes?
Prosecution said: 'Bullets recovered from both bodies were consistent with being fired from the same .38-calibre revolver' and argued that it was the same person who shot both the elderly Wycherleys, in the same way. Importantly (seems to me) they also argued the gun must have been taken to the home deliberately.....so proof of premeditation?
Christopher Edwards denied going to the house until after the couple's deaths, but did admit:
'he had been a member of a gun club based in Earls Court in London and had possessed a firearms certificate between 1979 and 1995.'
There was also an amazing statement from someone who was a neighbour at the time and saw Christopher Edwards digging a hole in the garden early in the morning (bolding is mine):
' "I can recall hearing a scraping sound......I recall saying to Karina in a joking way
'He's burying them in the garden' and we both laughed at that." '
http://www.shropshirestar.com/news/uk-news/2014/06/05/couple-accused-of-murdering-parents/