UK brand of antiseptic made by Pfizer Healthcare, available primarily in liquid form for dabbing on mouth ulcers, and for disinfecting (and mildly numbing) cuts and grazes. In diluted form it can be used as a gargle to replace bad breath with "TCP breath." It is also sold as a lozenge for sucking on and soothing sore throats.
In liquid form, its active ingredients are Chlorophenol (6 mg/ml), Phenol (1.75 mg/ml), Iodophenol (0.95 mg/ml) and Sodium Salicylate (0.5 mg/ml). It has a distinctive odour that most people in Britain will recognize as the smell of antiseptic.