Is it permissible for a husband to masturbate his wife when she is menstruating, especially if there is no physical contact and any sexual gratification would be done through clothes?

Fatwa, posted 4.22.2010, from United Kingdom, in:
Religious Authority: 
Qamruz Zaman
Fatwa Question or Essay Title: 
Is it permissible for a husband to masturbate his wife when she is menstruating, especially if there is no physical contact and any sexual gratification would be done through clothes?

The prohibited acts during menstruation is: (a) actual intercourse; (b) skin-to-skin contact between the woman's navel and knee. Everything else is permitted, without exception, including full sexual gratification for the woman (without the above).