Barclays is expected to report a 23% rise in Q1 pre-tax profits, driven by its US investment banking division, despite potential provisions for the motor finance scandal. Lloyds anticipates a 6% profit decline amid increased loan loss provisions, while NatWest projects a 20% profit rise as it returns to full private ownership, despite also raising provisions significantly. The motor finance scandal looms large, particularly for Lloyds, with potential liabilities estimated at £4.6 billion, impacting the sector's outlook amid economic uncertainties.