The default HMRC position for the division of rental income between a married couple is 50:50. If the property is actually owned in proportions other than 50:50 and HMRC are informed through the submission of a form 17, then the rental income will be split in proportion to the actual ownership.
If and when you sell the property in the future, then part of the gain may be subject to capital gains tax. Take a look at HS283 for more information on CGT and the main residence.
I hope this helps but let me know if you have any further questions.
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