You misunderstand...
7.3 Where a claim is based upon a written agreement –
(1) a copy (or copies) of the contract or documents constituting the agreement should be attached to or served with the particulars of claim and the original(s) should be available at the hearing, and
MCOL is just a way to issue a claim. It doesn’t change what the rules say must be in, or go with, the particulars of claim.
PD 16 paragraph 7.3(1) still bites for a contract claim. If the claimant says you breached a contract, they must set out the actual terms they rely on. If it’s a written contract, they should attach or serve it with the particulars, or at least set out the relevant terms verbatim. If it’s oral or
by conduct, they
must plead the terms and when/how they were agreed.
PD 7E (the MCOL practice direction) only relaxes the need to attach documents in the tiny MCOL text box. It does not relieve the claimant of proving the contract. If they cannot fit full particulars and the contract terms in the MCOL box, they must serve separate, fuller particulars within 14 days of service of the claim. Those separate particulars must include the contract terms said to be breached.
Bottom line: using MCOL doesn’t excuse a claimant from evidencing the contract. They must either provide the terms in the MCOL particulars or serve full particulars (with the terms) within 14 days. If they don’t, the pleadings are defective and open to challenge.