1. When was British Gas privatised?

8 December 1986.

2. What was the privatisation share price?

Shares were offered at 135p each. Payment was by instalments of 50p, 45p and 40p.

3. When was Centrica demerged?

The demerger of Centrica was on 17 February 1997, at which time BG plc came into existence.

4. What were the closing share prices of Centrica plc and BG plc on their first day of trading, 17 February 1997?

Centrica plc 64.25p and BG plc 173.25p.

5. When did BG Group plc come into existence?

BG Group plc replaced BG plc as the main holding company on 13 December 1999, following a capital restructuring.

6. When was Lattice demerged?

The demerger of Lattice was on 23 October 2000.

7. What were the closing share prices of Lattice plc and BG Group plc on the first day of trading of Lattice plc, 23 October 2000?

Lattice plc 153.25p and BG Group plc 270p.

8. I need additional information on the BG Group share price history for capital gains tax purposes?

Additional information is available from this link

9. I have British Gas plc and/or BG plc share certificates, what should I do with them?

These certificates are no longer valid and should be destroyed.

10. What should I do with my certificate(s) for BG plc B shares?

This certificate is no longer valid and should be destroyed. All B shares have either been purchased by the company or converted to ordinary shares in BG Group.