Cladding beam under balcony

[Streetfield]

Need to clad a wooden beam under a balcony. Effectively Fascia and soffit. Need to be able to clean it periodically but thinking black Powder coated aluminium to match gutters. Any ideas who could do a supply and fit in south Yorkshire region. Facing can run under grp drip tray overhang. Looking for a neat (not loads of external visible fixings). Thinking shop fitters as similar application to shop front cladding.