New Line in the Sand submission deadlines

We're outlining key changes to the Line in the Sand (LIS) logic

In April, two Modifications will be delivered that will present changes to current Code Cut-Off Data/Line in the Sand logic. 

These are: 

• Modification 0896, which seeks to reduce the current Code Cut-Off Date (Line in the Sand) from three–four years, to two–three years
• Modification 0886V - which seeks to amend the Code Cut-Off Date to a rolling period

Both Modifications were discussed and developed in parallel through the Distribution Workgroup and were subject to Authority decision. On 22 August 2025, Ofgem approved both Modifications and ChMC subsequently approved. This means that the current LIS logic will be updated from 1 April 2026, to reflect these Modifications.

What is changing from 1 April 2026?

The combined impact of the two Modifications is that the LIS will move back two years from the first of the current month, starting from 1 April 2026 onwards, and will roll each month on the first of that month.

Modification 0896: The LIS will change to a two–three year window.
 
Modification 0886V: The LIS will roll forward monthly instead of annually.

For example, in May 2026, the LIS will be May 2024, and this two-year window will continue to roll forward on a monthly basis. This will take effect from 1 May 2026.
 

What does that mean for you?

Due to the new monthly rolling LIS period, if you're a Shipper, you'll be required to submit RFA, DUP, JOB/UPD and Reads (UDR, UMR, UBR and RRP) within submission deadlines if you want them to be processed within SLA for the effective LIS period. 

We've created a new LIS calendar of submission deadlines as a quick reference guide.

Line in the Sand (LIS) submission deadlines

Please note:

Any RFAs received after these deadlines will be actioned on a best endeavours basis.

When the UBR, UDR and UMR files come into UK Link, we have D+2  business days to process them and send out a response.

Processing of any files received after these deadlines is not guaranteed.

Download new LIS calendar

Further information

Written communication has been issued confirming the anticipated submission timelines for April 2026 LIS activities.

You can find more information on the above changes on our dedicated XRN webpages.

XRN 5914  – Amend the Code Cut-Off Date to a Rolling Period (MOD 0886)

XRN 5922 – Shorten the current Code Cut-Off Date from 3-4 year to 2-3 year (MOD 0896) 

Detailed Design Change Pack

Get in touch 

Please email UKLinkDelivery@xoserve.com if you have any questions. 

Email us