4mm spliced to 3mm wire ok for uk plug socket? See pic

[Bruvvamoff]

I am upgrading an old socket in my kitchen.
The new plug has the ports in different places and now one of the live wires is too short.
I got some splice connectors and used some cable I had left over from a cabin build which is good quality and I didnt notice until I spliced that the existing cable in the wall is approx 4mm diameter but the cable I used is approx 3mm. (This is the width of wire and insulation)
Will this be ok? I'm impressed with the splice things they are very solid.

 

[chivers67]

The Distance is negligible and will make very little difference resistance wise. Can't see a Grommet where the cable enters though.

 

[Bruvvamoff]

The Distance is negligible and will make very little difference resistance wise. Can't see a Grommet where the cable enters though.

I've added a picture, let me know if it helps.

 

[chivers67]

The Neutral needs tucking in more but other than that should be fine

 

[Bruvvamoff]

The Neutral needs tucking in more but other than that should be fine

Will do, thanks