MOT failure, estimated cost to repair

Nearside rear position lamp adversely affected by the operation of another lamp.

Offside front position lamp not working

Rear (all stop lamps) stop lamp not working

Nearside rear suspension component mounting prescribed area is excessively corroded
Offside rear suspension component mounting prescribed area is excessively corroded.

How much would this cost to sort out?

I know all of them except for the first one with the lamp adversely affected? What's that?
 
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