Overflow pipe under kitchen sink leaking - what should I do?

[Quid_Nunc]

Hello,
From time to time some water appears to come out from an overflow pipe just above where the water enters the u-bend trap under the kitchen sink. This property has been recently acquired and is awaiting renovation. We think that the people who lived there before had a washing machine to the right of the sink, and it was somehow attached to the leaking pipe. The water is not turrned off at the main.

Two photos below. As you will see, there is a bit of limescale underneath the end of the pipe. Should I just collect the water, or is this indicative of some other sort of issue with the plumbing? What should I do?

Thank you,
Edward

 

[terryplumb]

The part that sticks out horizontally is an inlet for an appliance waste hose to connect to.
It needs blocking off.

 

[Quid_Nunc]

Thank you, Terryplumb. I bought 32mm and 40mm blocking off plugs (cheap enough, and not sure of the size). Have unscrewed the ring, but cannot pull the rest out. Seems to be some part of a plastic bag has been used to make the connection extra tight. Alas it is too much for my 60-year-old hands to unscrew, and in that space it is a bit awkward to get good leverage. Should I try to pull on it using pliers, cut it with a saw, or what/ Any ideas most welcome (see photo below).

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[denso13]

Unscrew the top and bottom nut and take the T piece out. Will then be easier to work on.

 

[oldbuffer]

To do the job properly you need to:
1. Purchase a McAlpine blanking plug type 228532.
2. Remove that white plastic spigot from the vertical pipe into which it is stuck.
3. Clean out the inside of the hole in the vertical pipe.
4. Insert the blanking plug, and screw the white plastic retaining nut back on. The spigot stays in place. The blanking plug seals the connection.

At a guess someone has put a bit of plastic bag over the end of the spigot to seal it, then screwed the ring back on. Over time the plastic bag has ruptured.

The spigot and plastic bag should pull straight out. Try wriggling the small end of the spigot in a circular motion to see if it helps.