23 years back, during 1st Sahara Cup they had to put additional stands and those were expensive tickets. Most of the tickets were bought by Indians ..... one of my neighbor Quraishi Bhai told us a story - a group of PAK fans couldn't buy/get ticket on first game; so before next game, they actually spent previous night at the stadium so that in early morning, when the gate is opened for daily ticket holders, they can be first one ................................. and, as Quraishi bhai regretted, police had to intervene that night because many more like him (them) did the same and neighborhood got scared with the unusual gathering - someone called emergency number.
I think, British Pakistanis (Bangladeshis as well, you'll see in WC) are more close to cricket because cricket itself is a major game in UK - so they can keep in touch. Lots of club cricket takes place where they themselves participate, national teams visit there regularly, native players play in leagues, live cricket telecast available, global events take place there. If South Asia was good in Baseball or Ice Hockey, you could have said the same for Canadian/US diaspora rather than UK, but there are many cricket enthusiast here in Toronto and I am sure it'll be same in NY or LA as well; but may be in other parts of North America, the number (of diaspora) is too little.
But, to my surprise, among 3 countries (can't say much about SRL), interest in cricket in IND & BD looks to be significantly higher than PAK. May be people watch more in TV, but in terms of stadium attendance, it's significantly poor. I have followed PAK Cup tournament for last few years, and even when National starts are participating, often crowd is poor - least said about domestic FC or List A is better. One main reason is that in PAK domestic tournaments/team don't have any geographical affiliation - Khurram Manzoor played for Lahore this time and Asif Ali for Karachi!!!!