@Hayley1987P this can happen depending on the local availability. One likely scensrio is you have a Superfast service over copper but every connection on your cabinet is sold and there is a waiting list for new connections. You can check if that applies to you by dntering your full address in this checker https://www.broadbandchecker.btwholesale.com/#/ADSL/AddressHome
Look at the line for VDSL if it says Waiting List under the righthand column for Availability thst is the resson Sky wont offer a new service at your address. If it doesnt and you want someone to explain what the result means post the result after removing any reference to your address.
In the past Openrreach would increase FTTC capacity that is much more unlikely sincecthey have switched to installing fibre to people's home (FTTP) If you are on a full cabinet switching ISPs risks losing your connection as in the switch it goes to the furst person in the waiting list.
=========================================================
65inch Sky Glass, 3 Sky Streaming Pucks, Sky Ultrafast + and Sky SR213(white Wifi Max hub) main Wifi from 3 TP-Link Deco M4 units in access point mode
