Kaffir Lime trees, grafted on flying dragon (dwarfing) rootstock, can easily be grown in a pot, in a sunny window during the winter and outside in the summer. They're not particullary fussy trees and readily available here in the states. I don't know what the regs are on shipping to Europe.

Hello Tinatina,
The EU have restrictions on plant material,especially Citrus and it's relatives,however seed may/maynot be imported. Combavas is the French translation to Kaffir lime ,as is Orang Orang Kfir in Arabic, Makrut in Thailand
These can be grown from seed,but,Citrus hystrix(porcupine quill), as the name implies have huge thorns,whereas the budded trees are semi-thornless.Alan asmith2@tampabay.rr.com