Hi
1) Yes,in the event of both of you and your husband going for mutual consent divorce, your husband can sign the mutual consent agreement at Indian embassy and also attend the court proceedings through SKYPE.
2) You should mention in the mutual consent agreement that your husband shall return the money of 75 lakhs at the time of mutual consent petition coming up for admission in the family court.
3) You should ensure that the 75lakhs given by your father is returned back prior to the mutual consent divorce petition coming up for final hearing.
4) Technically you have good grounds to pursue adultery case against your husband in india and also initiate divorce proceedings in UK. Divorce proceedings in UK will cost a fortune for your husband as you are entitled to the 75 Lakhs given by your father plus 50% share of his properties plus 50% of his monthly income all through your life time. So you should be able to leverage on the adultery card and get both your money and divorce in the short span of time.
5) You should also be aware that your husband is still subject of indian laws under 498a(dowry), 497 (Adultery) under IPC as these are offences committed by him whilst he was holding indian passport and as such he is liable to be penalised under indian laws as well. Your husband cannot take umbrage of he being a british citizen and escape indian laws as in today's scenario, we are witnessing many indian's being brought back to india to face charges due to proactive role played by our indian embassies with foreign governments.
Hope this information is useful.