UCL has an extremely strong English department and is one of the few in the UK that offer Oxbridge style tutorial teaching. However the course you note, Creative Arts and Humanities, is not based out of the UCL English department. So your experience would likely be different - it also looks to be a very new course as it's based at the new UCL East campus so you will probably be one of the first cohorts on the course, so keep that in mind.
However I'd also note that UCL has a number of standout humanities (and social science) faculties and departments, having one of the (if not the) only Hebrew & Jewish Studies departments in the UK, offering a wide range of European languages not offered anywhere else in the UK through SELCs and SSEES, and also is home of the Institute of Archaeology and Institute of Education, both of which are at the forefront of their fields. Notably most of the archaeology academics at Oxbridge and other comparable archaeology departments have at some point studied at or worked for the IoA. Suggestions that UCL is "just for science" speaks more to the lack of knowledge of the person saying it of any field of humanities, than of UCL.
However, can you apply through Extra if you hold offers? I thought you couldn't use Extra until you had all your decisions and held no offers.