By Lars Mucklejohn Swiss banking giant UBS has offered to repay former Credit Suisse clients 90 per cent of the funds they invested with specialist finance firm Greensill Capital, which collapsed in 2021. UBS said the offer commenced on Monday and would run until 31 July. The group added that it would take a $900m (£710m) provision in the second quarter to cover costs. The offer will not have a material impact on UBS’s financial results or capital requirements, the firm said. The move comes as UBS looks to clear the legacy issues of its former domestic rival Credit Suisse, which it acquired in…