30k is definitely a lot better than 23k. Also, I have friends in Leeds who live on salaries between Â£32 and Â£40k and they manage pretty well.
What you heard though is correct - mid 30s salary range is perfect for a single person as you can easily save a decent amount. With post tax take home on above Â£2000, one can easily save Â£1000 which is Rs 70000 a month at current conversion rate.
If married and getting Â£30k, you may struggle to save Rs50000 but I am in no position to say thats a certainty. 50k means approx Â£700 savings a month on a take home salary of Â£1900 (assuming you get Â£30k). This translates to you having about Â£1200.
You can easily rent a room only while your are single to save a lot more. I am not very sure about room rates but you could get a room with all bills included for about Â£400 a month (really not sure but cant be higher as you get the same for Â£150 a week in London). You can save a lot this way
Once married, aay you rent a nice flat for about Â£600 with Council Tax of about Â£120, that gives you a balance of Â£480 on living expenses which may be tight. But if you manage a flat with lower rent and plan well you could do it
And remember, if your partner manages to get a part time or full time job, then you guys are right back on track to meeting your target. From my personal experience, for the first few months after you are married it doesnt matter if you even just save Â£500 a month - as long as you have no commitments back home and just saving for yourself, you should be able to manage it.
All the best