SIR - John Phillpott's "bomb hole" in the river bank below the Northwick slip (Seven Days, June 16) was caused by a very large Willow Tree collapsing in the 1940 flood.

As it twisted out of the ground, its large root ball carried several tons of soil with it into the river.

It then rolled down river to the city road bridge, where it caused a worrying blockage.

The Army was called in to destroy it with explosives as there were fears the bridge would collapse.

Mr Morris from Pitchcroft subsequently excavated the site to create boat moorings.

The only bombs north of the city were a stick of three in a field at Hindlip, which caused me to fall off a chair in my Ombersley Road home.

R M SINCLAIR, Lower Broadheath.