Hello, my name is Ben and it is my pleasure to assist you with your question today.
The fact that the employer has spelled your name wrong in the response will not itself make the response invalid and this is just a simple administrative error, which would be resolved by you pointing out the correct spelling and the tribunal will then amend that if necessary.
The trial period itself will not really be a separate legal period of employment and you would still need to be issued with a written statement of employment particulars within 2 months of you starting to work there. The law requires an employer to issues employees that have been working there for more than a month with a written statement of employment particulars, with these being provided within 2 months of the start of their work.
In any event, the response can be accepted whatever it says, this is just the employer's response to your claim and they are free to claim anything they want in it - that is their right. The important part will come when this proceeds to a hearing in the tribunal when the tribunal and you will have the chance to challenge the response, ask witnesses to appear and cross examine them if necessary.
I would be grateful if you could please take a second to leave a positive rating - your question will not close and I can continue providing further advice if necessary. Thank you