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Use an RCD plug to feed the external socket http://www.diynot.com/shop/RCD_PLUG/3953

Is Hob seperate from the Oven? What is the wattage of the Hob? What is the wattage of the Oven? What is the cable length from the cooker position to the CU? Can you run another cable to the CU, if you need to?

What is the length of the cable?

If you are only connecting the oven to the outlet, then install a socket outlet in place of the cooker outlet. Check that the cable at the cooker outlet is not smaller than 2.5mm2. Install a 16A, type B, circuit breaker in the CU.

My Dear DB The VD figures given in BS 7671 are the worst case figures, at maximum cable working temp, which will be lower at lower cable working temps. With simple cable calculations, based on the BS 7671 tables, without cable working temp corrections, you would end up using a larger...

Circuit VD depends on the operating temp of the cable at the designed load, and not the on the maximum working temp of the cable. Cable protection is based on the Max working temp of the cable.

what's wrong with another DX200T

Cable length = 50m Cable size = 4mm2 SWA ( 2-3 Core) Power Supplied by Circuit = 3680W Installation Method = 1 Breaker protecting Cable = 16A CPC minimum 'S' = 1.90mm2 Steel or 0.51mm2(CU Equivelant) Volt drop = 7.81V Assuming a TN-C-S earthing system then Zs = 0.78 Ohms Fault Current...

If it is built in brick/conrete, then Run a 4mm2 cable from the non-RCD side of the CU. As before you must maintain the continuity of the CPC via the Armour of the SWA, but now the SWA is terminated in a Plastic J/B in the shed ( with the Armour being terminated in this J/B and going...

If you do not intend to have any extraneous conductive parts ( Water/Gas Pipes, Radiators, Structural Metal work etc which are earthed), and the shed is to be built from wood with wooden floor, then you could connect 4.0mm2 T&E wire from a 16A breaker from the 30mA RCD side in the CU...