Interested to see this as my DC went to this school. It's very competitive entry at 11 plus - 1500 sit entrance exams, 450 interviewed, 120 places. GCSE results are consistently about 94% 9-7. Very few leave before A-level because the alternatives in the area would be single sex mostly (eg. St Paul's Boys, St Paul's Girls, Godolphin and Latymer). These schools achieve very similar results, if not marginally better.
LU won a TES award for improving social mobility. It has the most developed bursary scheme of that type of school - 25% receive bursaries there. It has won Independent School if the Year recently, as have other schools in the area.
The school tends to be quite innovative with its curriculum. For instance, it always taught its own (assessed) course "World Perspectives" alongside GCSE. While other similar schools locally are still pushing students to do 4 A-levels, at LU they do 3 (plus EPQ), alongside the 'Latymer Diploma' which involves taking 4 courses from a 'carousel' of about 40 options; plus a number of hours volunteering; plus evidence of involvement in extra-curricular and leadership or entrepreneurial activities.
I heard about this plan to abolish GCSEs about a year ago. There was a consultation between various independent schools and quite a few were / are considering this move. If I remember rightly, other schools keen on this are the Francis Holland Schools (Sloane Sq and Regents Park), St Paul's Girls and possibly Godolphin and Latymer (plus others outside London). They seem to have decided that dropping GCSEs will be inevitable in all schools anyway (now that education until 18 is mandatory) as there will be a move towards a similar system as in most Euro countries where there is less emphasis on testing at 16, just progression into the next stage. It was something like that anyway - plus they don't want to hold students back by sticking to a GCSE curriculum (which is quite limited) if they are ready to move beyond that.
it's not planned for a few years yet and no doubt other schools will be announcing similar in the near future.