From the UK CAA website page "Initial Application for a PPL(A) Licence":
Additional Requirements
Your medical records must be held by the UK CAA and you must hold a valid UK issued EASA Class 2 Medical Certificate.
You must have a current and valid Language Proficiency level acceptable to the UK CAA. This is only required for Flight Radio Telephony Operators Licence (FRTOL) or for Instrument Rating (IR) (my emphasis)
If ELP is not required for licence issue it certainly cannot be required for first solo!