By Lars Mucklejohn Vanquis Banking Group has swung to an annual loss and slashed its dividend after the specialist lender saw a jump in impairment charges following a profit warning for 2024 earlier this month. The Bradford-based bank, which primarily services subprime customers, reported a statutory pretax loss of £4.4m in 2023, compared with a £110.1m profit in 2022. On an adjusted basis, it posted a £24.9m pretax profit last year, compared with £126.6m in 2022. Vanquis’ earnings were dragged down by a £100m year-on-year jump in impairment charges to £166.1m, with £130m coming from its cards…