You appear to have extensions connected directly to the incoming cable, either at the back of the master socket or at a junction box. Officially this is all owned by Openreach, and any changes should only be made by them. However it's very unlikely that this extension wiring was 'official', so there will probably be a charge for correcting it.
If the extensions are connected at a junction box, then it's easy to disconnect the extensions without disturbing the other wiring. But if they are connected at the back of the master socket then you should leave well alone unless you're confident that you know what you're doing.