The Bedfordshire, Cambridgeshire and Hertfordshire MajorCrimeUnit wants to trace anyone who saw a white Ford Transit-style van seen speeding from the Brunel Road area.
Detectives from the Bedfordshire, Cambridgeshire and Hertfordshire MajorCrimeUnit have appealed for anyone who saw him in Poynters Road, or a black 4x4-type car parked in Tomlinson Avenue, to come forward.
Four officers from the Sussex Police majorcrime branch unit spent 10 days in Phnom Penh, working alongside the national police, but Eddie's movements remained unknown.
The force's G Division, which includes the Force Major Investigation Team and the Serious and Organised CrimeUnit, will be reviewed with a view to cutting costs.