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I would connect the hob to the cooker outlet (connection at rear) and leave it with the 40amp mcb protection then you could run another 2.5mm t&e radial circuit from your consumer unit from a 16amp mcb to a 13 amp socket in the unit adjacent to oven and fit flex and 13amp plugtop with 13amp fuse...

you could also look into doing away with the RCCBO's BS7671 makes allowances for circuits used by trained staff no requirement for RCD protection also the way the supply is run to the PC's could be altered ie Surface trunking with socket outlets built in could be run around the office

take your 230v ( L N E)supply to the switch connect live to one end of the switch marked L in or common ( Red or Brown) take the outgoing supply to your lights and connect the (Red or Brown) to the other side of the switch marked L1 or L2 and join the neutrals together (Blacks or Blues) into...

I calculated your total load to be approx 1.5kw divide this by 230 and you have a current of 6.5amps approx so no you cannot run it from the 5 amp supply you will have to put in a new 6amp supply to this section and remember they will have to be RCD protected if you cannot get the cable 50mm...

Your bathroom lights as stated before would have to be rated for the zone they will be in the average house this will mean zone 1 which case the lights have to be IP44 min they can be 230v as long as you cannot reach them from a shower or bath but remember BS7671 (17th edition) requires them to...

The 3 lights are 12volt ac ?? they are supplied via a 230/12volt transformer the 230volt side of the transformer can be connected to a 13amp plug with the fuse changed to 3 amps or as suggested previously a fused spur unit (this is a lot more tidy)you can either screw the transformer onto the...

As a general rule I always put the cooker isolation switch 300mm away from cooker and remember it has to be readily accessible in case of an emergency switch off