Tuesday broker round-up

Touchstone Exploration: Canaccord downgrades to speculative buy with a target price of 140p.

Gulf Keystone Petroleum: Berenberg downgrades to hold with a target price of 190p.

Vistry Group: Berenberg reiterates buy with a target price of 1,270p.

D4t4: Canaccord reiterates buy with a target price of 400p.

HomeServe: Liberum reiterates buy with a target price of 1,500p.

Clinigen: Liberum reiterates buy with a target price of 1,050p.

Centrica: RBC Capital Market reiterates outperform with a target price of 7,500p.

HSBC: RBC Capital Market reiterates sector perform with a target price of 465p.