| Group [member] | Company [member] | ||
| Trade and other non-current payables [abstract] | |||
| Non-current trade payables [abstract] | |||
| Trade payables | |||
| Trade payables due to related parties | |||
| Other non-current trade payables | |||
| Total non-current trade payables | |||
| Non-current other payables [abstract] | |||
| Other payables due to related parties | |||
| Other payables due to trustees | |||
| Total non-current other payables due to related parties | |||
| Non -current non-trade payables[abstract] | |||
| Deferred income | |||
| Accruals | |||
| Retention payables | |||
| Deposits and advanced billings | |||
| Other non-current non-trade payables | |||
| Total non-current non-trade payables | |||
| Other non-current payables | |||
| Total trade and other non-current payables | |||