UK Salamander HomeBoost Pump Installation.

Hi All

I am looking to install a Salamander Home boost pump under the kitchen sink cabinet. Need some advise:

Currently next to the kitchen sink cabinet I have the dishwasher and Washing machine which are individually connected to fused spur and socket and I don't have spare fused spur and socket for the pump.

Need some advise:

Q: Could an additional spur and socket be installed for the pump via the ring and would it need a minor works certificate or a full Part P compliance certificate - as shown in the first two pictures(blue is existing, red required). Drawback a lot chasing into the wall etc will be involved.

Q: On the opposite wall, I have a spare fused spur and socket. Could I replace the socket with a flex, run 2.5mm 3 core 25A cable, under the kitchen cabinets to behind the sink cabinet and install a socket there. Effectively not altering any circuit, only moving the location of the socket after the spur by about 7m cable extension.
Only about half a meter of cable visible on the wall, rest hidden behind the kitchen cabinets - as shown in the last picture.

Would this require a minor works certificate?

The max current rating of the pump is only 1.8 Amps.

What would be the best option?

Thanks a lot.