Hudson
UK Flight Testing Accidents 1940 to 1971 ISBN0 85130 311 1 has a para on this accident and it confirms all the details you quoted.
The only extra bits of info are that the aircraft was an FTB for a Dart turboprop mounted in the nose, the aircraft serial was NG465 and fuel starvation to all four Merlins was the quoted cause. Don’t know if that means the tanks were dry.
It quotes three refs as its sources which I don’t think will be much help but you never know:
The Avro Lancaster ISBN 0 946627 30 4
The aircraft history log cards at RAE (these just could be in the hands of FAST
www.airsciences.org.uk who have salvaged as much as possible from the developers that purchased the RAE site from the MOD a few years back)
Rolls Royce Heritage Trust – David Birch
JF