The FTSE 100 experienced a slight decline on Wednesday, primarily due to less-than-stellar corporate updates. Shares of Imperial Brands took a significant hit, dropping approximately 7% after the unexpected news of CEO Stefan Bomhard's resignation. Similarly, Experian shares fell by 2.8% following the release of growth guidance for the year that fell just short of analyst forecasts. On the other hand, the FTSE 250 maintained its positive trend, bolstered by a robust surge in Burberry shares due to earnings that surpassed expectations. Attention is now shifting to upcoming UK GDP data, which is anticipated to indicate stronger quarterly growth but a deceleration in year-on-year growth, potentially impacting forecasts regarding the Bank of England's policy decisions.