Fraser.
I have seen it suggested in this NG -uk.diy,that 6 years is a reasonable
time to expect such items to "live" but haven't seen anything to back this
up.
Stuart

Have a look on www.tradingstandards.gov.uk they have a lot of information in
their advice leaflet's.

If I were you, I would give Trading Standards a call, and see what they feel
about it - they will advise you of what to do if they feel you have
reasonable grounds.

Just enter your postcode on their site, and it will give you the phone
number of a local office.

Sparks...