Googling WJ753 comes up with a fair bit. Including the following
On 19 June 1978, after a heavy landing at Marham, it swung off the runway sustaining Cat 5 damage. It was stuck off charge four days later on the 23rd June 1978.
Googling WT478 does not mention an accident
T.4 - WT478
Masquerading as the Canberra prototype RAF Wyton's T.4, WT478, is seen here at the Canberra's 40th anniversary at Wyton in 1989. "Bee" Beamont flew in it on that weekend - 40 years on.
This T.4 was deliverd to 15 MU in April 1955 and was subsequently owned by many users starting with 231 OCU. Then on to Station Flight RAF Akrotiri, then to 39Sqd, to 13Sqd, 360Sqd, 100Sqd and then back to 231 OCU. It finished its days as "BA" on 231 OCU at RAF Wyton and was in open storage there in 1992.