Quotes can be weird.
For 9x window blinds (supply and install): ~£1k from one company. ~£7k from another. Not identical (I slightly preferred the blinds from the mid expensive company), but was definitely comparable spec so no hesitation to go with the cheaper option.
For a days work of ~a dozen rudimentary electrical jobs: two quotes for ~£400 within about a tenner of each other. Felt kinda sorry that the guy we didn’t go with was such a near miss. Three or four others we contacted didn’t even get as far as bothering to turn up or even acknowledge the enquiry.
For supply and installation of a TV and speakers onto wall brackets, and a new plug socket, with wiring, cabling, and associated chasing: the guy Richer Sounds sent round basically refused to even quote. Apparently because it wasn’t a gaudy full home cinema megascreen status symbol project, if the fella’s Facebook page is anything to go by.
Always gotta be worth getting two or preferably three quotes and take it from there, though, innit.