v3.26.1
Cover Page
6 Months Ended
Jun. 30, 2026
Cover [Abstract]  
Document Type 6-K
Amendment Flag false
Document Period End Date Jun. 30, 2026
Document Fiscal Year Focus 2026
Document Fiscal Period Focus Q2
Entity Registrant Name NUCANA PLC
Entity Central Index Key 0001709626
Current Fiscal Year End Date --12-31