What do British people say instead of pounds?

Could you elaborate on the alternative terms that British individuals might use in place of the term "pounds" when referring to their currency? Are there colloquial or slang expressions that are commonly employed within the UK as substitutes for the official name of their monetary unit? Additionally, are there any regional variations or dialectal differences in the terminology used across the country? Understanding these nuances may provide insight into the cultural and linguistic landscape of the UK's financial lexicon.