are the price movements related to those speeches of the central banks such as the BOE?
Logically it has no impact because bitcoin is decentral and he stands alone, but if we think broadly it greatly affects because the user's interest in the crypto is influenced by the news especially if the cetral bank gives a good or bad speech about the cryptocurrency it definitely affects the movement, this is a speculation of my own.
I also think that there may not be any impact of central bank on bitcoin. Bitcoin is decentralize currency, therefore it is not under influence of any country, bank or under any country. Bitcoin is decentralized anonymous currency and hope that it will remain as free from the influence of any state or bank, we can hope that bitcoin remain in its congenial stage forever.