A “Deed” of assignment is one way a creditor may assign a debt, but it’s not the only one. It can also be done by way of a simple contract. This is a private agreement between Lowell and the original creditor.
Van Lyn Developments-v-Pelias Construction [1969] 1 QB 607
This case was about the rules for a party giving a valid notice of assignment. It does not relate to proof of assignment. It doesn’t set rules on what documents you are allowed to see.
The highest court ruling so far on this subject is the case of Promontoria (Oak)-v-Emanuel [2021] EWCA Civ 1682, where the Court of Appeal stated that if you wish to challenge assignment, you should ask the original creditor, and produce evidence that they, as the original owner of the debt, dispute the assignment. You normally have no right to dispute the assignment unless the original creditor provides this evidence.
Section 44 Companies Act 2006
This section sets rules for how a company must sign certain documents but doesn’t apply to assignment of debt or notices of assignment.
In any case, rules about how a document must be signed, would normally only affect whether the company signing it, can be held to an agreement if they later dispute it. So, if the company signing the document doesn’t dispute the document, questions about its signature won’t affect its validity.
Bill of Exchange Act 1882
A “Bill of Exchange” is a legally binding written promise of payment. One common example is payment by cheque. The Bill of Exchange Act 1882 makes rules about those documents. It has absolutely nothing to do with the assignment of debt.