For regular U.K. excursion;
1. Duck tape
2. Resuscitation mask
3. Ambulance / trauma dressing
4. Tweezers / tick twister
5. Glucose gel or tablets
6. Rehydration powder
7. All the other useful stuff like plasters, steri-strips, micro-pore, anti-histamine med, tampons / sanitary pads, cling...