What has already been agreed?published at 10:44 British Summer Time

Germany and the UK have already reached agreements on migration and defence ahead of the summit today.
On migration, Downing Street say Germany will tighten its laws to crack down on smuggling gangs by the end of 2025. The changes will make it illegal in Germany to facilitate illegal migration to the UK.
Downing Street said the move - which was agreed under former Chancellor Olaf Scholz's term - will make it easier for German authorities to investigate and take action against warehouses and storage facilities used by smugglers to conceal small boats intended for illegal Channel crossings to the UK.
As for defence, it has been announced that German technology company STARK will open a new factory in Swindon, Wiltshire.
It will create more than 100 skilled jobs and be the first site they have outside Germany. The move is part of a series of commercial investments in the UK, worth more than £200m, which are being announced to coincide with the visit.