Contract with a trading name only, successfully open a court claim?

[AdeAP]

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If the case has now been amended so tgat the claimant is (e.g.) Fred Smith t/a Fred Sith Builders, in what way is he trying to "link" that to the limited company?

No this is my point, this is not the case.
The claimant made the original claim in the name of limited company not named in the contract.
They then made an application to change the claimant name from the Ltd company name to *only the trading name* (not an individual t/a sole trader, nor a Ltd company t/a trading name).
The "link" comes in that same application to change to the trading name, the claimant made efforts to say the trading name was the trading name of the Ltd company adn they were one and the same.
However for which, none of their documentation I received (contract, invoices, receipts, etc) referred to the Ltd company nor meets the legal requirement for a Ltd company using a trading name.

I worry that you do not understand the distinction. Sorry if I am wrong.

I completely understand how a sole trader and Ltd company can trade under a different trading name, but neither were followed in the claimant's application to change the name.

Thank you for taking the time to engage, I feel now that I have the answer from Rob

[atticus]

In that case, this applicant needs to be pinned down: who or what trades under that name?