LGW will remain at 4 flights mon-fri on a IOM based 146-300 i believe, if not, it will be the currently based 146-100 with i think 3 on saturday and sunday.
MAN will be taken down from 5 to 4 flights mon-fri, losing the lunchtime service, again with slightly different frequencies of a weekend. This will be operated on an IOM based EMB145.
With SOU, not sure but it might well be 2 flights a day i think, with a SOU based Q400 or EMB145