It drops the “h” sound from the start of worlds, so “horse” sounds like “orse”, and it uses a glottal stop (so “water” sounds like “wau-ah”). Those features are in some other accents, especially in the south east.
It also uses a lot of slang words, called “rhyming slang”. Most British people know a few examples, but almost no-one uses it regularly. It rhymes a word with a phrase, then uses another word from that phrase.
Examples: “Apples and pears” for “stairs” “Trouble and strife” for “wife” “Dog and bone” for “phone”.
To complicate matters people often only say the non-rhyming part: talk on the dog, go up the apples, ask the trouble.