on deposit for maturities of less than one year ► Increase in capital expenditure for development of production processes and related assets 2016 2015 £'000 £'000 Operating loss (4,574) (4,062) Depreciation 169 111 IFRS 2 Share based payments 235 156 Net working capital movement (14) 206 Cash used in operations (4,184) (3,589) Interest received 44 82 Tax received 189 111 Capital expenditure (1,087) (385) Free cash flow (5,038) (3,781) Proceeds from issue of shares 8,031 13 Opening cash at bank 4,709 8,477 Cash at bank 7,702 4,709