Barclays Bank PLC has various funding mechanisms to fund its daily business operations.
It can use deposits from customers to create mortgages and loans for example. It can borrow (issue bonds) on the open market to raise more cash, to create more loans or use that cash to fund business expansion, such as opening new branches in emerging markets.
It also uses other financial instruments such as subordinated debt and preference shares to raise cash to fund its operations
One can see the funding levels it needs for its business.
EUR 8,351,730,000
GBP 13,798,949,000
YEN 35,000,000,000
US$ 28,301,458,000
That is in UK£
6,130,590,000 + 13,798,949,000 + 199,783,000 + 19,260,200,000
= £39,389,522,000
Yes, that is £39.3 Billion.
And this is just one funding programme at Barclays.