It said this was partly due to a continuation "albeit on a reduced scale, of transfers from a competitor platform". A source said that the unnamed rival is Barclays' Stockbroker service, which faced a slew of investor complaints last year following a technical glitch after it moved customers to a new service called Smart Investor. The issue forced some to jump to rivals, with Hargreaves Lansdown citing "significant" levels of transfers to its business in the second half of last year.