Pricing for suppliers
In general, most harpists and string ensembles tend to quote on a per hour basis, meaning they'll charge a minimum performance fee covering two or three hours, and then an hourly rate after that.
On average, you can expect a string quartet covering your ceremony and drinks reception to cost anywhere between £650 and £1000.
Acoustic solo acts and acoustic duos will usually offer an all-in price to cover the wedding ceremony and drinks reception with prices starting from £250/£300 per musician.