If You Had A Twin, But Didn't Realise...
Family Life8 mins ago
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For more on marking an answer as the "Best Answer", please visit our FAQ.The above is correct and you definitely can't have more than one main residence for tax purposes. The non-main residence will be assessed for capital gains tax in the tax year in which sell it, the difference between the purchase and sale price, offset by some taper relief, and of course capital gains tax starts after an annual threshold is exceeded.
It is not up to a solicitor to do anything. It is beyond the scope of this site to advise you and I would recommend you either read up on capital gains on property or invest some of your potential gains in a tax accountant to help you. It would be worthwhile because there are ways of minimising this thing. For example, you can elect which house is your main residence and it may be possible to switch between one house and the other, especially if you lived in the other one. Depending on when you bought each property it may best for you to declare the one you are now selling as your main residence and take the tax hit later on sale of the one you aren't selling.
Talk to an accountant rather than have sleepless nights. Count yourself lucky that you wisely invested in property at a time when prices shot up.