This is even more important if students are made an offer, because Indian students will require a student Visa study at any UK university.
Like with most languages, learning is fastest and easiest when actually studying in the country where it is widely spoken. However, a certain basic knowledge is required before even entering the UK.
This is not such a daunting task for Indian students, because English is widely spoken across India, and often one of the main reasons why the UK is a destination of choice for many Indians.
However, evidence of English language skills test and results need to be documented before starting any university in the UK or indeed when any job application is made.