It's a mixed bag on the Hunter front.
Some of the UK-based aircraft still use cartridge start (Hunter T.7 XL573 G-BVGH and
PR.11 WT723 G-PRII to name two), whereas others like Delta Jets' two Hunter T.7s use electric start.
Hunter F.6A XF516, which sadly crashed in 2003, may have used Avpin cartridges to start it.
I'd guess that most will switch to electric over the coming years though.
Mark