Nice looking elm. I have some that look like this also. I wouldn't worry about repotting this year. Elms will grow in any soil as long as its not concrete. If it drains the tree will do just fine.
I am just a realist and don't fall in so much with all the hype about soil and tools and fertilizer, apex shapes, and overall techniques. I am into WHAT WORKS BEST FOR ME, and if thats not repotting this year, then repot it next year. If you don't have a certain hyped soil component, substitute something you can get that works for you in your area. Using what someone does in some state USA means nothing to you in Ireland.
It is a given that on a world wide bonsai discussion forum you will get a myriad of suggestions and some will be pretty darn militant about Why you have to "follow their ideas about bonsai or your doomed to failure". My suggestion, pursue the forum for its comical value and entertainment. If you get caught up in all the back and fourth, then you become part of the entertainment.
If I were to offer one nugget of advice it would be to watch the top. Elms are very apical, and the top will get so dense and the bottom will get weaker and weaker. Prune and thin the top out extensively and allow the bottom to run. It needs strength and looks pretty weak. Currently the canopy is flame shaped and thats the wrong look for an elm. Thats due to the bottom being weak. Keep at it, its a nice tree.