We bought our house last September and the previous owners still have:
Several Bank Accounts registered here - Husband, Wife, Daughter
Wife is still on the Electoral Register
Husband's car is still registered here with the DVLA
As well as vast amounts of junk.
I know re-direct services are pretty shite ("Mr Andrew Person" will NOT Re-direct "Mr A Person" only Mr Andrew Person etc) but you'd think they'd have moved the basics - Banking, Electoral Register etc.