This is stated on the website of the office of the British Prime Minister. 

“The Ukrainian government fears that it will run out of financial resources by autumn if it is not provided with urgent financial assistance.

To help deal with the pressure, the UK is ready to offer another $525 million in World Bank guarantees later this year. 

To date, the UK has already provided Ukraine with economic and humanitarian assistance worth £1.5 billion and military assistance worth £1.3 billion.

Earlier, The Sunday Times reported that British Prime Minister Boris Johnson intends to ask Ukrainian President Volodymyr Zelensky to visit the kingdom in October, even the organization of a personal meeting with Queen Elizabeth II is being worked out.