Figure 1

This graphs provides a overview in complaints numbers from 2016 to 2017.
A - D are data reported by heat suppliers to Heat Trust
E is reported by the Energy Ombudsman to Heat Trust
Please note, that it is not possible to infer that all deadlock letter result in a complaint to the Ombudsman, furthermore, customer have up to 12months from a deadlock letter to make a complaint to the Energy Ombudsman.

Complaints comparison

Figure 2