Okay, let's have a look at your source step by step.
No problem there, a lot of migrants do flow into the UK, as do people flow out of it.
So, 260,000 a year. Okay. Where are these people coming from?
So, India, China, and Pakistan. Let's have a look at the typical citizen of those countries.
We'll start with India.
India is the seventh largest country in the world, with a 2011 population of roughly 1.2 billion people. The population density is around 388 people per square kilometer, ranking 31st with other countries.
The PPP rated GDP of India is 8.7 trillion, or $6,664 USD per person (so 3rd in world GDP, 141st in PPP rated GDP per capita).
The HDI of India rated in 2014 was 0.609, or 130th in the world.
Indian education isn't the best, but still quite good considering the circumstances. Free and Compulsory education is treated as a right from the age of 6 to 14, and private schools do exist with 29% of 6-14 y/o students being educated in them.
In 2012, 96.5% of all rural children (6-14) were enrolled in education. Total literacy is 74%, with 82.2% literacy for males and 65.5% literacy for females.
69% of people go onto secondary education, and 25% of people go on to tertiary education. 40% of people obtain a secondary diploma (AKA high school diploma) with 7% obtaining a post secondary diploma.
Considering that most poor uneducated people in India would find it hard (if not impossible) to emigrate to the UK, we can make an assumption that most Indian expats in the UK would have at least a secondary education. As thus, they can contribute to the country in a way that is not cheap labour.
China is quite similar. 1.339 billion people in 2013, population density of 145 people per square kilometer.
PPP rated GDP is 20 trillion dollars (aka the world's largest economy), with a GDP per capita of 15,095 USD, which is 83rd in the world.
HDI is 0.727, or 90th in the world.
Chinese education is mandatory from 6 to 15 years of age, and optional for students of 16-18 years of age. Literacy is 96.7%, with 98.2% for males and 94.5% for females.
121 million children are enrolled in primary education, 78.4 million are enrolled in secondary education.
A 99% attendance rate for primary school and a 80% rate for both primary and middle school has been reported by the Chinese government.
China has over 20 million students enrolled in higher education. In 2010, the Chinese government expected 6 million students to graduate, with 63% likely to enter the work force.
Again, as with India, we can expect the average Chinese immigrant to be at least somewhat educated. They will be able to help with the work force in a way that is not dumb labour.
Pakistan is quite similar to the previous two countries with a few differences.
Population of 202 million, density of 260 per square kilometer. GDP(PPP) of 984 billion (26th) with a GDP(PPP) per capita of $5,084 USD.
HDI of 0.538, which is 147th.
The state is required to give free and mandatory education to students from 3 to 16 years of age. Literacy ranges from 96% to 28% depending on the area. Pakistan produces 445,000 university graduates per year. However, it has an astonishing out of school rate of 5.1 million children.
So. Compare this to Syria. Does your source compare in any way to the influx of refugees, or does it compare to people coming to the UK for a better life from somewhat built up countries (ones NOT being bombed and under constant turmoil that is)?