1.5 mm cable - replace with 2.5 mm

[dal]

Hello, I want to move a plug socket a couple of feet, away from the direction the cable is feeding the plug socket from. I'm going to replace the section of cable between this plug socket and the one before.
It currently has 1.5 mm T & E cable which I want to replace with 2.5 mm T & E . (The cable running to the socket before the one I want to move is 2.5mm.)

Can someone just confirm this is ok, I mean it's ok to have a cable that can carry more current than what will pass through it but not the other way round.




BTW this is a radial circuit on a 16 AMP MCB, so no returning cable.

 

[dal]

Ok cheers.
Another question - the cable is going in hardwall/ plaster does it need to go in conduit or is it ok being cable clipped to the wall ( block )

 

[dal]

Its on a rcd protected circuit.
Thanks.