The difference between this and the regular U11 are, as the title suggests, memory capacity. Regular U11 comes with 64GB storage and 4GB RAM, an already respectable number; the upgraded U11 has 128GB ROM and 6GB RAM, making a considerably more powerful device. How does this upgrade change the phone’s price? Significantly but also not by as much as it could. The more memory-able U11 costs £699, which is fifty pounds more than the original costs.
Whether or not this is a good deal is up to you.