Get one of the stainless steel ones, pre heat it with boiling water before putting anything you want to keep hot in it. http://www.argos.co.uk/product/9270518
Cheers!
Just in case.... Don't ever put it in a dishwasher as it fucks it up. Mine went in probably three times before it stopped working.
@ltc started
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Get one of the stainless steel ones, pre heat it with boiling water before putting anything you want to keep hot in it.
http://www.argos.co.uk/product/9270518