FOI request (FOIR-161513867)

I am interested to know whether:

(a) You hold personal email addresses as part of your Electoral Register, and if so,

(b) how many emails you hold in the Electoral Register;

(c) What the source or sources of these emails is;

(d) Whether you have included all or some portion of these emails as part of the datasets you gave to election candidates at the 2019 General Election;

(e) If so, how many emails were supplied;

(f) Whether you supplied email details in other prior elections.