There is no standard wiring for a pull cord. With a wall switch it is normal to use the ceiling rose not only as a supply to the lamp but also as a junction box in order to reduce the amount of cable between each lamp in the radial circuit.
However with a pull cord it would not reduce the wire used so may not follow that convention.
Also once moved one will need to measure the impedance and submit the results to the local authority building control under Part P building regulations and the hire of the meters and LABC fees are likely to be around £200 which is likely more than you will be charged but a registered electrician to do the whole job.
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