XML 121 R86.htm IDEA: XBRL DOCUMENT v3.21.1
Available for sale assets (Details)
12 Months Ended
Dec. 31, 2018
GBP (£)
Available for sale assets [Abstract]  
Cash consideration £ 27,451,000
Gain on disposal of available for sale assets 4,979,000
Available for sale reserve £ 18,471,000