Depends how "posh" you want to be ..Two bacon rolls and two teas in Dent Yorkshire a few weeks ago £22 . 50. Same everywhere now I think.
Bacon & Sausage bun & a regular Latte in Greggs ( outlets all over the UK) just over £3.00..slightly more " expensive" if you want it in a baguette..
Sausage & Egg McMuffin & a regular Latte at McDonalds..currently £2.69.
Both on the breakfast menu at each establishment prior to 11.00am ..