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A man has been charged with murder after a mum-of-four's body was discovered in undergrowth close to a busy main road.
The body of Ms Anderson, from Finsbury Park, north London, was found by a member of the public at around 3pm on Monday, Surrey Police said.
Her family paid tribute, saying: "Our dear sister and daughter has gone. We loved you.
"In this life you faced many challenges and still you had a big heart.
"Goodbye dear Helen."
Surrey Police said: "Helen's family are being supported by specially trained officers.
"Her four children are being supported by family at this difficult time."
A 51-year-old man, also from Hackney, was arrested in connection with the death and has been released on bail.
Officers are appealing for witnesses who may have seen a decommissioned double-decker Brighton and Hove bus in the north London area between 7.30pm on 20 August and 3pm on 23 August.
Detectives also want to speak to anyone who saw the same bus, either being driven or stationary, in the Guildford area between 3am and 4am on 23 August.
Detective Chief Inspector Emma Vickers urged anyone with information to come forward.
She said: "We are continuing to appeal for witnesses in relation to this investigation.
"If you have any information which could help our investigation, please contact us straight away. You can also upload information straight to our Major Incident Public Portal."
Anyone with any information or dashcam, CCTV or smart doorbell footage should contact the police on 101, quoting PR/45210089588.