Liguriani played great set in Club at Celtic Connections. Ipercussonici were very good when they played Womad at Charlton Park a couple of years ago. Fiamma Fumana are fine exponents of the Martin Bennett school of roots music, though it's a while since they were in UK. Strongly agree about Nidi d'Arac, would have loved to have seen them this tour, they had a disappointingly small main-stage crowd for a fine set when at Womad Charlton Park. (More fool the masses.)
Linda Bull's programme "Give 'em the Boot" on citr.ca is a good source and as with all their shows there's a podcast archive. One act I picked up on from this are Sequoia Bisquits, whose eponymous album and a live set are on BandCamp.