Complying with existing regulations and coping with future regulatory changes represent the biggest opportunity for startups to break into the potentially lucrative world of FinTech (Financial Technology), according to two seasoned FinTech players who spoke at The Wall Street Journal Tech Cafe in London.

"The easiest way to start a business to work within the finance sector is to look for a regulation that is coming down the pipe and develop a solution for that thing," said Kirk Wylie, co-founder of OpenGamma, an...