Value the mighty SISU - I did say I work in the city, not the local flea-market, but here goes.
SISU Capital - only income appears to be management fee for a small (c £40m) hedge fund. Value of this fund has been shrinking over the last few years (in a rising global market) so underlying assets may be very risky and difficult to value. Plus, about 90% of this fund appears to be owned by one entity. If that investment was withdrawn, the company would not be able to meet obligations for property lease and staff. Cash, according to last return, less than £1m, other assets negligible. No attraction as a going concern.
I can't see anything worth mentioning in anything else, but of course have no details of the fabulous tax-haven companies. Difficult, however, to see how they have any, legitimate, worthwhile assets as there is no evidence that they have investment in anything else.
The combined worth of the whole lot? They might be able to scrape together the (old) rent on the Ricoh for a year.