Infringements of Controlled Airspace are a hot topic within General Aviation, and reviewing real-life experience can provide useful learnings for students and the more experienced pilots alike.  Here's the CAA analysis of an infringement of the  Luton Zone that is well worth a read.  As a result of this aircraft being in the wrong place commercial flights were disrupted to avoid further safety risks.  The Pilot was prosecuted and fined over £7000.

• Take time over planning, make sure you plot your route with care;
• Check your equipment - make sure your compass reading is correct;
• Undertake a gross error check;
• Beware conformation bias - make sure that waypoint is correct;
• If in doubt communicate.