If you sell the property (I'm assuming this is not a furnished holiday let) in June 2015, you will make a gain of £109,000 (£240,000 - £110,000 - £15,000 - £6,000). You can also deduct the costs of buying and selling (legal fees, survey fees, stamp duty, selling agent fees etc) to reduce the gain further. HMRC may ask to see proof of the improvement expenditure.
The first £11,100 of gains made by an individual in 2015/16 will be exempt from Capital Gains Tax so that will leave you with a taxable gain of £97,900. The sum of the basic rate tax band and the basic personal allowance for 2015/16 is planned to be £42,285 (£31,785 + £10,500) and if you deduct your annual income from that, you are left with £8,285 of the lower rate tax band. So, £8,285 of the taxable gain will be charged to CGT at 18% (£1,491.30) and £89,615 will be charged to CGT at 28% (£25,092.20).
Your CGT liability will be £26,585.30 (£1,491.30 + £25,092.20) and this will be payable on 31 January 2017.
I hope this helps but let me know if you have any further questions.