Sinsull - there is a condom-like device for incontinent men that can be worn attached to a waist belt - kinda like the old menstruation belts women had to wear before self-adhesive pads came out., they are referred to as condom sheaths or condom catheters to differentiate from catheters that must be worn internally (OUCH!). The condom sheath catheter has a tube that goes to a collection bag which is either strapped to the leg or adhered to the leg.

A better option would be what are called "male incontinence shields" - they are a shield designed to cover the area of the men's brief likely to become wet if the man has an accident or light seepage of urine. Here in the USA, the manufacturer called TENA makes a good male shield. They used to call their product SERENITY but are changing over all their shields to the name TENA.

I live in a neighborhood with a large elderly population and a number of men living with advanced AIDS. I've had to shop for these things a often as a favor. If it's only urine that's the issue, a male incontinence pad should be fine. if the seepage is constant, a condom sheath catheter and bag is better.

Search on those terms on Amazon UK and you should bring up what you need