Timing belt, water pump, tensioner and idler... don't skimp on a belt change, do the lot.
I've got a 1.6TS, don't think my cam locks will fit your engine, but mines were about £30 from euro car parts so if you are planning on keeping the car any length of time, worth keeping a set.
Get a set of RIBE sockets, you will need them to do the timing belt.
When you tighten bolts and screws, do it gently, some of them are made of toffee I think and are quite easy to shear. Use a torque wrench.
Other common faults (on my two 147s at least) the driver side brake light warning, it's a connector at the rear brake light cluster that overheats sometimes and the connector loses its springiness making an intermittent bad connection, you can push the connector in the terminal block backwards and it puts enough tension on it to make a good connection.
Things just stop working in the car, like electric mirrors, electric windows, etc. take the controls out of the driver side door panel, un plug them and turn the key a few times without starting the engine, then reconnect it and the problems magically dissapear.
They are great fun to drive