So according to BBC oxford sport it is a compliance issue.
To give a bit of a different perspective on this from personal experience.... I work for a company that has/does receive fairly significant investments from overseas, often south east Asia, and can say this is a very credible excuse. The issue is very tight compliance laws due to the money laundering act. We have had things tied up for months for various checks with no warning, and often have to stagger investments over long period to remain under certain thresholds. Always worse when money coming from areas like se Asia, and rather ironically in relation to this case, when the figure is higher.
What also appears to make this situation worse is it seems to money comes from a number of accounts(personal?) of the directors.
Totally agree they should be aware of this risks and have a contingency of cash available. However, my belief is still the payment issues are still largely to do with these sort of issues, rather than money not being there at all.