EDMs:
'Early day motions (EDMs) are motions submitted for debate in the House of Commons for which no day has been fixed.
As there is no specific time allocated to EDMs very few are debated. However, many attract a great deal of public interest and media coverage.
What are EDMs used for?
EDMs are used to put on record the views of individual MPs or to draw attention to specific events or campaigns. Topics covered by EDMs vary widely.
By attracting the signatures of other MPs, they can be used to demonstrate the level of parliamentary support for a particular cause or point of view.
How many signatures do EDMs attract?
In an average session only six or seven EDMs reach over two hundred signatures. Around seventy or eighty get over one hundred signatures. The majority will attract only one or two signatures.
There is no rule whereby the number of signatures affects the likelihood of an EDM being debated.'
...
'A 'prayer' is a particular type of EDM that is used, by convention, when MPs wish to object formally to a statutory instrument. If a motion 'praying' that an instrument 'be annulled' is tabled within 40 days of it being laid before Parliament, a debate may be arranged in a Delegated Legislation Committee or, more rarely, in the Chamber.'
https://www.parliament.uk/about/how/business/edms/
So. This whole exercise doesn't even mean anything unless a debate gets tabled, and a vote taken to reject the Guidance.