The helicopters that have been grounded are all of the EC135 model, which are widely used by emergency services.
The model was used by the following air ambulance services:
- Dorset & Somerset
- East Anglian
- Hampshire & Isle Of Wight
- Midlands Air Ambulance
More top news
The operation to recover the unexploded bomb near the Houses of Parliament let to disruption in central London overnight.
Southern parts of England and Wales will see sunny skies after a frosty start.
A police spokesman said the incident in the Bourke Street Mall on Friday was not related to terrorism.