Ann: Half Yearly Report and Accounts, page-6

some operating expenses have doubles but all in all total expenses and operating costs only growing far less than the 30-50% revenue growth.

1Q18 rev 276
2Q18 rev 553 up 100%
3Q18 rev 829 up 50% ( on 1H18 guidance )
4Q18 rev 1078 up 30% - 1224 up 50% based on 30-50% growth

this also doesn't include any additional customers and contracts just internal growth by further provision expansion of services to already announced customers.