WHAT a wonderful gadget Howard Stapleton has invented to deter the feral teenagers who spoil life for others (Oxford Mail, July 13) .

I have a similar gadget at home to deter dogs and cats from my garden.

The RSPCA does not complain but the ‘do-gooders’ of Liberty want it banned.

Can Mr Stapleton make a gadget that will work on Liberty? I would happily buy one.

RW TUCKER, Kingsway Drive, Kidlington