So you have to pay 190 pounds to get single entry Visa for up to 3 or 6 months? No way. According to their website in Nepal I would have to pay 150 pounds and In Poland the Embassy asks for 50 pounds for 6 months Visa. So I don't get it.
For example in Netherlands Dutch citizens get 6 months mutiple entry Visa for 70 euro, that's 65 pounds.

I've just thrown 17500 nr into google and it gave me £125, for the Indian visa...
According to https://www.hcilondon.in/pages.php?id=28 a visa for 1 year, single entry will cost me £100. If this is correct, I could apply for it before I head off to Nepal. I am aware it starts from apply date, rather than entry but I won't be staying in India that long anyway. I think I'd prefer to have this visa sorted before I left the UK as I think it's the only one I can't get on arrival(?)
According to https://www.hcilondon.in/pages.php?id=28 a visa for 1 year, single entry will cost me £100.
But that is not the price (nor the cost) of the visa.
http://www.vfsglobal.com/India/UK/Tourist.html
If 10 quid either way matters to you, then you shouldn't be travelling at all.