The Barclays 356 page annual report, a good read if you have time, some important nuggets can be found if you dig deep.
[http://group.barclays.com/about-barclays/investor-relations/annual-reports]

page 8: Paid £3.2 Billion (£3,200,000 million) in tax.

page 66: UK’s Legal & General Group plc own 480,805,132 shares = 3.99% of Barclays

page 66: His Highness Sheikh Mansour Bin Zayed Al Nahyanb of Abu Dhabi owns 858,546,492 shares = 7.02% of Barclays
[http://en.wikipedia.org/wiki/Mansour_bin_Zayed_Al_Nahyan]

Page 98: 373 people earned between £1,000,001 to £2,500,000 (nice work when you find it)

Page 206: Balance Sheet:

Total assets £1,490,321 million = £1,490 Billion = £1.490 Trillion
Trading portfolio assets £145,030 million = £145 Billion (effectively BarCap Trading Activities)
Customer Deposits £385,707 million = £385 Billion
Loans and advances to customers £425,729 million = £425 Billion

The UK 2012 GDP was £1,541,465 Million = £1,541 Billion = £1.541 Trillion
Assets of Barclays = £1,490,321 Million = £1,490 Billion = £1.490 Trillion

Thus Barclays’s assets = 96% of the UK 2012 GDP. The bank is HUGE.