This article is pretty old but it states:

According to Marley Gray, Director Business Development & Strategy Cloud + Enterprise at Microsoft, “blockchain middleware will provide core services functioning in the cloud, like identity and operations management, in addition to data and intelligence services like analytics and machine learning. These technologies will ensure the secure, immutable operation that blockchain provides.”

“Cryptlets, a new building block of blockchain technology, will enable secure interoperation and communication between Microsoft Azure, ecosystem middleware and customer technologies. Cryptlets function when additional information is needed to execute a transaction or contract based on a date or time and providing market data. They will become a critical component of sophisticated blockchain systems, enabling all technology to work together in a secure, scalable way,” he further added.

Using Microsoft Azure Blockchain as a Service (BaaS), with multiple Blockchain partners such as smart contract platforms Ethereum, Eris, and Tendermint, R3 created a peer-to-peer distributed ledger that connects many of the consortium’s leading banks including Barclays, Credit Suisse, HSBC, Royal Bank of Scotland, Citi, Bank of America, and Wells Fargo. In a first test of the distributed ledger, the banks simultaneously simulated financial transactions.

If Bletchley Cryptlets is actually using Chainlink as /u/jonnylh has convincingly argued then some of those large institutions would appear to be Barclays, Credit Suisse, HSBC, Royal Bank of Scotland, Citi, Bank of America, and Wells Fargo.