@MrsA4 that does not appear to be an Openreach connection as they usually say Openreach, British Telecom or if very old Post Office on it but it is difficult to know due to the layers of paint. If you have a different master socket you use to connect your Sky Broadband service and phone that could be an extension connection. Sky and Openreach can move their own wiring but will often charge you to do so call Sky to ask.
Extension wiring is your property so you can remove it if you want. If and when your connection is upgraded to full fibre all of the old phone wiring is redundant and can be removed.
=========================================================
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
