On 2015\10\17 13:52, David C wrote:

As for value for money, does the Goblin scheme include any of the
possible junctions with existing 25kV routes, such as to the GN at
Harringay, or the Midland / Thameslink connection from Junction Road
Junction?

Yes and yes, as mentioned in the webpage listed in the OP.

"The CP5 enhancements delivery plan published in June detailed the core
electrification scheme in the line:
Gospel Oak Junction to South Tottenham West Junction;
Gospel Oak platform 3 (bay platform);
Carlton Road Junction to Junction Road Junction;
Upper Holloway Reception Line;
Harringay Park Junction to Harringay Junction;
South Tottenham East Junction to Woodgrange Park Junction;
Barking Station Junction to Barking Platform 1 buffer stops; and
All crossovers between Gospel Oak Junction / Carlton Road Junction and
Barking Station Junction"