Wiring double-insulated (class II) pendant into earthed circuit
The UK splice blocks make it really simple because they give you exactly the number of splices you need for almost every case. Notice how your splice groups are 2-3-3.   Watch this: 

Switch loop; also feeding another lamp (optional)

Always-live coming in from supply (brown, or in old system, red)  
Always-live out to the switch  (typically brown) 

Switched-live coming in from the switch (typically blue taped brown) 
Switched-live to cable to the next lamp (brown) (optional)
Switched-live to this here lamp (brown)

Neutral coming in from supply (blue, or in old system, black)
Neutral to cable to the next lamp (blue) (optional)
Neutral to this here lamp (blue)


Switch loop; also supplying always-live to something else

Always-live coming in from supply (brown, or in old system, red)  
Always-live out to the switch  (typically brown) 
Always-live to cable to the next usage point (brown) (optional)

Switched-live coming in from the switch (typically blue taped brown) 
Switched-live to this here lamp (brown)

Neutral coming in from supply (blue, or in old system, black)
Neutral to cable to the next usage point (blue) (optional)
Neutral to this here lamp (blue)


The only case you'd ever need to splice elsewhere or double-stack is if you had a "tee" arrangement.