The biggest risers on the FTSE 100 were Babcock International, up 30p at 1,176p; Scottish Mortgage Investment Trust, up 25p at 1,094.5p; Polar Capital Technology Trust, up 10.5p at 475p; Rolls-Royce, up 22.5p at 1,107p; and Prudential, up 19.5p at 1,097.5p.