BT junction box

["Patrick Lidstone" <patrick@xxxxxxxxxxxx>]

I have inherited a small white BT junction box (2" x 1") as part
of
the existing extension wiring in my house. Removing the lid reveals
some IDC style connectors, but unlike the usual V-shaped krone-style
contacts used on phone sockets, these look more like the eye of a
needle (with a small gap). If this description is too confusing, I can
post a photo...

I want to add another extension spur to the junction box, but it
doesn't co-operate to prodding with a screwdriver. Any ideas on what
tool, or technique, do I need to use to get another connection in there?
Thanks
Patrick