Do solar panels have to be south-facing to be worthwhile?
In the UK, south facing panels will generate more than other orientations - but solar panels will still generate savings and income for you even if your roof faces slightly off south; even a straight east or west-facing roof can generate around 80% of the electricity that a south-facing install would.
When solar panels are installed, they are positioned to maximize sun exposure, meaning sun-tracking systems are not required. Some newer solar panels do integrate tracking systems to change the panel’s positioning throughout the day, but the additional expense may not be worth the limited efficiency gains.