You need to understand the process. You will be able to submit your evidence with your Witness Statement (WS). Before we get to that, we need to know who is representing UKCPM and the precise details of their Particulars of Claim (PoC).
Please show us the N1SDT claim form you received, redacting only your personal details, the claim number and the MCOL password. We need to see all dates and times.
Secondly, we need to know the exact wording of your defence, not a summary. Did you submit your defence using the MCOL website?
Now that you've received notice of allocation to the small claims track of your local court, you need to complete the N180DQ and send it and a copy to the court and the claimant or their solicitor, if they're using one. Don't use the paper form they sent you. Download your own here and fill it in online and then send it in a single email addressed to dq.cnbc@justice.gov.uk and the claimant (or their solicitor if they're using one) and CC in yourself.
https://assets.publishing.service.gov.uk/media/66a8b019ce1fd0da7b592f43/N180_0724.pdfEventually, you will receive directions from the case management judge at your local county court with a hearing date and a deadline for submitting your WS and evidence. This can take many months, depending on how busy your local court is.
So, please show us the requested info and we can assist in getting this sorted for you.