What are the trading hours at the London Stock Exchange?

Excuse me, I'm interested in understanding the operational timings of the financial markets, specifically the London Stock Exchange. Could you please elaborate on what the trading hours are at the LSE? Are they consistent throughout the week, or do they vary on certain days? Additionally, I'd appreciate any insight into whether there are pre-market or post-market trading sessions available for investors to participate in. Thank you for your assistance in clarifying this matter.