Yes there are three issues that will all flag up as a combination of the original seats being removed and trigger warning lights
1 - The seat belt pre-tensioners.
Solution - Just removed the seat belt buckle and installed that on the new seat base and plugged it in.
2- Both seat side airbags are missing so the car can find them and assume there faulty.
Solution. On the plug on the floor that remains establish which pins relate to the airbag, the last two on the far side. Insert a 4.7ohm 1/2 wat resistor from Maplins, 9 pence each!! into the 2 pins (I made a tiny patch cable.). This emulates the feedback given by the missing airbag.
3 - The seat pad that detects when the seat is occupied in the original seats are now obviously missing.
Solution. Insert a seat pad emulator. £30 a side.
Reset the fault codes and good to go.