The District Council's 'relocation project' has been called a 'vanity project' more than once:
Futures Forum: Knowle relocation project: "Rather than expensive vanity projects, they should stay in their old home in Sidmouth (even expensive to heat) and concentrate on spending our money more wisely."
Futures Forum: Knowle relocation project: 'fiddling while Rome burns'
This is very much part of the larger context of planning as preening:
Futures Forum: Of vanity projects and local government
Futures Forum: "Vanity projects, speculation and unwise development" >>> "Bankruptcy risk as ‘desperate’ councils play the property market"
If we compare this particular project with another:
Boris tried to push Garden Bridge over line on last day in office | News | Architects Journal
And the wider media is taking it up:
Boris Johnson blames Garden Bridge project blunders on successor - BBC News
Boris blusters his way around his £40m garden bridge fiasco | John Crace | Politics | The Guardian
Boris Johnson facing grilling over £37m spent on failed Thames Garden Bridge project | The Independent
Boris Johnson's garden bridge scheme scrapped | Daily Mail Online
As the London oversight committee looks a little deeper:
GLA Oversight Committee - Boris Johnson - the Garden Bridge - YouTube