IND is proposing that fees be increased for visas. While it is going to the House of Commons to be debated, it is unlikely that it won't be approved.
Many of the categories are increasing over 100%. ILR's for example will be going from £335 to £750. Also UKVisa settlement visas will go from £260 to £500. Because of the pending changes for those in long term marriages only getting an FLR upon entry, means that someone who lives outside the UK and marries a UK citizen and decides to move to the UK will have to pay £1825 to become a UK citizen compared with £460 as of today. This represents a 296% increase.