Great this is the news I wanted to hear, this means I can run 2 rings
in the kitchen and still have a spare MCB in the CU :-)

One problem is that high load appliances can unbalance a ring, if they're
not distributed around it. If you are able to rewire the entire circuit, it
may be worth doing the ring in 4mm, or even to run a radial circuit in 6mm
cable. This way, any imbalance doesn't matter as you are unlikely to
overload one leg.

Giving the option to put all the new lights required in kitchen and recess
on a
new circuit.

I still think putting just a kitchen onto its own lighting circuit is a bit
of a waste of your last remaining spare MCB. However, I can't complain, as I
did exactly this for mine. This had more to do the fact that the existing
house was all off one circuit and I promised myself that I would eventually
distribute the load over 2 circuits. Not that I ever will. OTOH, I have 4
spare ways, still.

THis is what I thought, thanks for confirming that. I take it I just
straight swap the MCB for a 10A.

Someone may have switched it to prevent the MCB tripping when a bulb blows.
A safer solution would have been to use a 6/10A Type C. Better still is to
not use incandescent lightbulbs, but have CFLs exclusively.

Also the CU we have is not a split RCD/non RCD type its a new box, but
just a 100A main switch, and 6 MCBs. SO I guess both kitchen circuits
will be non RCB.

The portable socket MCB (and the MCB for non-kitchen sockets) should be
replaced by a single width RCBO B32A/30mA. The fixed appliance MCB should
remain.

Christian.