FerroNATS are probably trying to attract some of the many Spanish Nationals who got their Student ATCO licences in England only to find they were unemployable in the UK.
I've met one; mid 30s, very pleasant lady. The CAA insisted she take a full A/G Radio Operator exam (both written and practical) before she could even do A/G Radio at an airfield as she'd had no 'live' experience!! (I was her examiner, that's how I know).