They appear to be 9th in size in the UK according to Forbes.
HSBC appears to be the Largest in the World (due to Assets it looks like)

  • Rank Company Country Industry Sales ($bil) Profits ($bil) Assets ($bil) Market Value ($bil)
  • 1 HSBC Holdings United Kingdom Banking 146.50 19.13 2,348.98 180.81
  • 7 BP United Kingdom Oil & Gas Operations 281.03 20.60 236.08 204.94
  • 10 Royal Bank of Scotland United Kingdom Banking 108.45 14.62 3,807.51 76.64
  • 25 Barclays United Kingdom Banking 79.70 8.76 2,432.34 62.43
  • 44 HBOS United Kingdom Banking 100.32 8.10 1,336.17 44.84
  • 54 Lloyds TSB Group United Kingdom Banking 58.74 6.53 701.08 50.95
  • 79 GlaxoSmithKline United Kingdom Drugs & Biotechnology 45.07 10.35 57.16 120.05
  • 101 Aviva United Kingdom Insurance 81.83 2.65 633.91 31.90
  • 116 Tesco United Kingdom Food Markets 83.61 3.71 48.58 62.41