Many reasons have been put forward for thinking again about building the Garden Bridge across the River Thames.
The crossing would link the South Bank, near the Oxo Tower, with Temple in the City of London.
The huge and unexpected cost to the public purse as well as the need to fell trees to build a bridge carrying trees are just some of the problems raised.
Above all there is the question of whether the fine natural stretch of water at Kings Reach should be spoilt by a new structure.
The decision by Lambeth Council to allow the bridge to be built is being challenged in the High Court.
The bill for the appeal will be around £24,000 and so far a quarter has been raised.
“If all the thousands of people who have signed petitions against the bridge gave a few pounds I would have all the costs covered,” says Waterloo Community Development Group director Michael Ball who successfully requested the judicial review.
A number of people have given £5 just to be part of the effort.
You can donate online here.