Can I change my travel plans or intended date of arrival after getting UK visit visa ? Will there be problem at immigration? I mentioned in my application that I want to visit my brother in mid week of March but now I want to delay it for a month .
There is no problem if you have changed within 6months time frame. Most importantly they also advise to plans after visa confirmation.plans are plans rather if you stated any specific time bound reason like going to attend birthday, wedding etc.
Changing the date of your trip shouldn’t be a problem providing the new timeframe is within your visa validity - plans change, after all. If you submitted an invitation letter from your brother with your application, you could have him send you an email with the new dates and a reference to why the plan changed, so that you have something to show Immigration in the UK if asked. Changing the length of your trip could cause you a problem if it’s a significant change eg 2 weeks to 2 months Cancelled UK visa on entry