Note 22 - Share Capital - Components of Issued and Fully Paid (Details) (Parentheticals) - GBP (£)	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017
Statement Line Items [Line Items]
ordinary shares (in shares)	77,535,770	49,509,394
Weighted average share price	£ 0.10	£ 0.01

The number of shares issued by the entity, for which full payment has been received.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2017-01-01
-Paragraph 79
-Subparagraph a
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_79_a_ii&doctype=Standard
-URIDate 2017-03-09

Name:	ifrs-full_NumberOfSharesIssuedAndFullyPaid
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant