Travelling to the UK on an accompanied child visa

I am travelling to the UK for a school tour and I have an accompanied child visa, as I am under 18, which clearly states that it's only valid if accompanied by my teacher. However I wish to stay in the UK longer. Can I leave the UK alone a few days after my teacher has left?
Best Answer
No you shouldn't do so, even if someone suggests you can. Some people like to suggest that just because UK does not have exit immigration nobody will notice this, don't listen to them.
The adult listed on your visa is supposed to take care of your well being throughout the trip and not just facilitate you with an entry. If you remain there and the said adult leaves the UK you/they might have trouble going to the UK again.
Personal Experience:
After our first trip to the UK when we were checking in at the airport to go back home the check-in officer noticed that our child's surname was different from ours and looked at our passports for a few more minutes. Then she asked: Do you happen to carry his birth certificate with you? I had it and presented it immediately. She saw it and said perfect and gave us our boarding passes.
This incident does not directly relate to your situation but it does relate to the fact that they really care about child visitors even on exit. Even when me and my wife were both listed on his visa and were with him we were still asked for a certificate. Imagine being really unaccompanied on exit.
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Can dependent visa travel to UK?
Your partner and children ('dependants') may be able to apply to come to the UK or stay longer in the UK. You must be one of the following: a full-time student on a postgraduate level course (RQF level 7 or above) that lasts 9 months or longer.Can parents accompany minor students to UK?
Bringing family members with youTo be eligible for a Parent of a Child Student visa you must be the only parent accompanying your child in the UK. The child's other parent must live abroad, and cannot apply to join you in the UK.Can you travel to the UK as a minor?
Travelling aloneYou can travel to the UK without an adult (someone over the age of 18). Your parent or guardian will need to provide their: written consent for you to travel to the UK.Can family members visit the UK?
Your friend or family member can apply for a visitor visa so they can visit you in the UK. Visitor visas are usually for up to 6 months.CHILD VISA UK - VISA FOR BRINGING YOUR CHILD TO THE UK
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Suzy Hazelwood, Samy, Nubia Navarro (nubikini), Pixabay