What one wears for 'leakage' depends upon just much of it there actually is.
The most commonly sold product is 'level 2' pads. (It's generally the only level that, say, supermarket own-brand products can be found for). They're perfectly good enough for men who, like me, might get a tiny (but embarrassing) dribble when, say, lifting a leg to tie one's shoelace. However they won't be anywhere good enough for men who've got little, or no, control over their bladders.
Tena Men 'level 2' pads are sold in all large supermarkets, as well as in pharmacies. Supermarkets generally charge either £4 or £4.50 for a pack of ten, with independent pharmacies tending to charge closer to a fiver for them.
Similar supermarket own-brand products typically cost £3 for 10 but some are much better than others. For example, Morrison's own-brand ones are much the same quality as the Tena Men ones and are what I use. On the other hand, Asda's own-brand pads seem to just be women's pads that have been repackaged; they're not as wide as either the Tena Men or Morrison's ones and it's easy to get leakage to one side of them. So I definitely don't recommend those.