Mk4 Dish and Sat Signal Optimum?
Correct Power Lead used? (Blue end with correct length black lines)
Correct HDMI lead used? (Pink one end with SKY on both sides of head)
Compression F connectors at dish?
Compression F connectors at box?
Picture settings to highest resolution?
Any extra info relevant to revisit and how visit was resolved e.g. box swap, reposition of booster, hardwire etc