Someone was asking earlier about the paintballing site. Reposting this link that gives the history of it and more info - it is next to the wooded area where the body was found.
If it has been a hotspot for fly tipping recently, the accused may have thought a body wrapped in a builder's bag may not be easily found amongst a load of fly tipping.
With all the extra searching in that area now, I am also wondering if they are possibly looking for more bodies. As well as items for evidence.
"A resident who lives nearby says the secluded plot has become a fly-tipping hotspot, particularly during lockdown."
The story of the abandoned leisure complex at centre of Sarah murder case