Rewire radial circuit in kitchen

[jackdor]

hi all,
Myself and an other electrician are currently doing a rewire of an empty 3 bed detached house. We have installed separate ring circuits for up and down stairs but are thinking about putting a radial circuit into the kitchen as it is only small and will only have 1 switched fused spur and 2 double sockets. The reason for this is that the kitchen is an extension and can only get water, gas and electrical feeds from above via some boxing in. We don't want to run these sockets off the upstairs ring, but also don't want to run the feeds from down stairs up then down again. We could simply run 1 cable back to the ccu and put on a 16amp breaker. is this ok? or do we need to put another 2.5 in and make this a ring for 2 sockets and a switched fused spur.
thanks for your replys

 

[Lou7]

Quite a few sparks i've spoken to don't bother with rings anymore, 20amp radials easier to test, 2 x 20amp radials = 40A
1 x ring =32A

 

[andekoch]

If you use a ring,you will have 2 x 2.5mm at each socket which makes 5mm.If you use 4mm you will have to 2 x 4mm at each socket which amounts to 8mm apart from the last socket.IMO a better solution

what am I missing here. 2x4mm = 8mm only if the feed comes from both sides ie a ring. In the case of a radial the last socket and any intermediate socket has the same size feed cable. What did I miss?