I applied and got an unconditional offer to UEA. One of the factors that made me choose it is its high national rankings (15th on Complete, 14th on The Guardian, 14th on Sunday Times, 18th on Shanghai Rankings), in combination with relatively low requirements (ABB for Computer Science). This makes it higher ranked than a lot of Russell Group universities. However, there is a discrepancy as they do not line up with the world rankings (240 on QS, 198 on Times), whereas most universities which would otherwise be ranked lower than UEA in the national rankings are higher in the world rankings. Is there any explanation for this difference? While I know rankings aren't everything, this has perplexed me.