I work in a major UK bank on the Corporate side. I would say that for the amount of money Barclays has out to Hornby vs. Negative PR that would result if they called in the receivers and broke up / sold off the group rather than trying to help them turnaround will be at the forefront of their minds.
If Barclays do go down a forced sell off then it means the problems are seen as intractable which is very bad news, likely be down to one major model manufacturer (which itself is going through supply issues).