REGARDING 'Reform needed over alarm sales' (Letters, March 13), as a Crime Reduction Officer with Lancashire Constabulary, I am all too aware of this type of complaint over the sale and installation of intruder alarms and other security devices, often purchased on impulse as a result of a 'cold call' by a salesman.

'Cold calling' and telephone sales in themselves are not illegal. The law gives customers a 'cooling off' period in case they change their mind after the salesman has left.

The problem is, some sharp companies will install the equipment before the cooling off period has passed and the only way the customer can cancel the contract is in writing and then they have to get the equipment removed with all the trouble that involves. In circumstances like these, Lancashire Trading Standards Department can offer help.

For some older people setting and using an intruder alarm system can be quite difficult. For this reason, many choose instead to fit a 'Care Line' from their local council, Help the Aged, Age Concern or a similar organisation.

'Care Line' is a special telephone that can automatically make an emergency call to a monitoring centre when a pendant or wrist button worn by the person, is pressed.

It's cheaper and easier for older people to use than an intruder alarm and can work for any emergency in the house. It will not prevent burglaries, but older people want help and reassurance immediately and 'Care Line' does this.

Police advice in dealing with cold callers or telesales people is not to let them into your home, or agree to anything, or sign anything, unless you are absolutely certain in your own mind what you are doing and not under pressure from the salesman.

As a rule of thumb, the cost of a domestic intruder alarm system that will only sound on your premises is generally less than £400. The police cannot recommend installers, but we do offer advice on alarm systems. The main recommendation is to get three quotes from companies who are known to neighbours and friends and try to pick someone local.

Intruder alarms are still considered the best deterrent to criminals and installation of a system is highly recommended. It's up to you who you choose, but please look out for older neighbours when the 'super salesmen' are in your area.

DAVE SYKES, (Crime Reduction Officer, Lancashire Constabulary), Burnley Police Station, Parker Lane, Burnley.