UK election outcomes have nothing to do with gerrymandering and everything to do with being a multi-party democracy using a FPTP electoral system, which tends to boost the representation of leading parties at the expense of smaller parties. Indeed, you'd actually need gerrymandering for such a system to have any hope of returning seats broadly in proportion to vote share.
(the conspiracy theory about disenfranchisement advanced by the blog article is orthogonal to the tendency of the FPTP electoral system to distort shares of actual votes. It's also a little difficult to take seriously an argument which suggests that a short-lived poll tax abolished in 1991 would be a significant factor in the 2015 election. Especially when the party that enacted it spent 13 of the intervening years out of power, with the electoral system and distribution of voters heavily favouring their rivals at the time. The article is equally ludicrous in suggesting Labour would be disadvantaged by a fraction of voters in strongly Labour-supporting boroughs being under financial pressure to relocate)
(the conspiracy theory about disenfranchisement advanced by the blog article is orthogonal to the tendency of the FPTP electoral system to distort shares of actual votes. It's also a little difficult to take seriously an argument which suggests that a short-lived poll tax abolished in 1991 would be a significant factor in the 2015 election. Especially when the party that enacted it spent 13 of the intervening years out of power, with the electoral system and distribution of voters heavily favouring their rivals at the time. The article is equally ludicrous in suggesting Labour would be disadvantaged by a fraction of voters in strongly Labour-supporting boroughs being under financial pressure to relocate)