Yes, the children are arranged due to comprehension level. So mixed ages in each class. Currently there are 5 classes, the largest class size we've been in over the years has been 10 kids. Each class has teacher, SALT and an LSA. Plus my son comes with another LSA as his one to one so high level of staffing. We go in once a term for a hour class observation, followed by a chat with the Teacher and SALT. That is really the only chance we get to see the teaching in action so I am unable to give you very much in the way of concrete facts in terms of how they work the magic and "how they teach conversational skills" as requested etc. Sorry! But when you visit you'll be able to ask specifics to your situation, in my experience the visit is not rushed and you can spend plenty of time chatting. When we joined the school DS had to have a two day ICAN assessment before a place is offered which I assume is still the case, an Ed Psych formed part of the assessment.
What I do know is my son has a full time SALT in his class which was something we could not have dreamed about in mainstream. But beyond the class the whole curriculum and teaching style and wider school at large is all geared towards a simplified language model, there is a lot of emphasis on visual supports. All the lessons I have witnessed have been very hands on teaching, with lots of discussion, calling on kids to participate, I am not sure how many lessons per day and haven't had a timetable this year but in previous years we did have a timetable provided and it was at least 5 different ones each day I think. I know that DS currently has at least 5 scheduled SALT sessions as a minimum per week including a one private session per week, one group session, and he takes part in things they call a vocab session, buzzwords, a friends group session and something else I've forgotten! (think that friends group might be the one where they work on social skills and conversation with 2 or 3 other kids). Even in the group of 10 kids in his class they always seem to do maths in two separate groups when I've been on observation and it seems to be the norm to stream the class into groups for various activities. We saw him do typing his weekend news in ICT followed by investigating the meanings of what would be this week's spellings on our last visit and the class had been split into two groups for that. In his individual SALT session at the moment the therapist is working on production of sound /t/ - ie. oral motor strength stuff and practising forming the sounds with a mirror and then using the sound and t words with games and in real life situations etc...we spent ages on /s/ and at age 9 he now finally can produce an /s/ sound which is a miracle (my son has facial palsy and nerve weaknesses) and has improved his clarity no end. We get SALT targets each term and ours focus on speech production and social skills as that is what my DS needs but for other kids the SLCN would be different and therefore I can only tell you what they do for my DS.
My son is not sporty at all and being VI finds PE difficult, so I am not well informed about sports stuff, they have an after school football club and annual sports day, I think that some of the overnighters go to a gym club too. They do swimming on some terms as the school has a pool.
It's a very small school so you might feel you'd need to meet the sports needs outside of school via clubs etc.
They follow the National Curriculum, you get a topic plan each term showing the topics which they are covering and some of the targets for each subject. Plus your child's own targets for each half term. They have music and art with a specialist teacher and then most other things with their class team.
Anyway, please don't take any of the above as undisputed facts as this is just my impressions of the school. It's funny that answering this makes me realise how little I know about what actually goes on at school. It's the same for my other child in a regular mainstream school too though, we don't get invited in to watch huge swathes of their school experience. But Meath is working for our DS. And it would have been worth the battle! It's not closed either, I don't want to give that impression, all staff are very approachable and you can always talk to someone about concerns. Plus we often go in outside of class observations for talent show, concerts, parent workshops, sports day, socials, pta meetings, etc...I just haven't had to dig too deeply into the teaching style as I have witnessed my DS's progress which has been good.
I will ask a couple of other Meath parents to see if they will pop over to the thread to add their answers to your questions.
The best thing will be the visit as you will see the school yourself and know if you can see your child there. Good luck!