Bike, Ridgeback Terrain, restoration project (Lewes BN7)

Ridgeback Terrain 24 bike, suit child age 8-12, been outside, needs new brake cable, tyres are old, bits of surface rust. See photos. New they are about £400, and a friend said are decent bikes, so basis for a good bike with some work and new bits, maybe a good winter project. We were given it years ago, now too small. Collect central Lewes.