I got called to this Dudley windsor safe in Kent as the code had stoped working. Its a pretty high security safe with decent features designed to keep people out. This safe had been opened before by another engineer. Not quite sure why they did what they did but it assisted me in opening this.
One thing of note with this safe again was the choice of batteries. They were the cheapest batteries you could get, these locks just do not work well with inferior power supplies. Ensure you use the proper batteries (name brands – decent quality) or else you may have a costly bill of a locksmith or safe engineer.