Did you live in the mobile home for the entirety of your ownership of it?
Are you sure you want to pay for a phone call on top of the cost of the question? I'm sure I can answer your query without the extra expense.
Can you tell me how much your share was. How long did you own a share of the mobile home? Did you inherit your spouse's share when she died? Was the £40,500 the sale price for your share or the whole? How long ago did you move out? What did the home cost to buy?
Last question. Do you know what the mobile home was worth when you inherited your friend's half?
Leave this with me while I do some calculations. They will take a while so please bear with me.
You should cancel the phone call request to avoid another expert calling.
Only gains made since 31 March 1982 are taxable so you would need to know what the mobile home was worth as at 31 March 1982 to get a truly accurate gain figure. In addition, as you inherited your late friend's half, that half will have a cost equal to its value when your friend passed away so your cost for CGT purposes will be greater then £10,000. The costs of improvements (not general maintenance) can be deducted from the gain. However I will use a cost £10,000 for the purposes of this answer.
From March 1982 to the present is about 34 years. You appear to have lived in the home until about 1989. The gain for the period that it was your main home will be exempt from CGT as will the last 18 months of ownership regardless, a total of 8.5 years. That covers £7,625 of the gain (£30,500 / 34 years x 8.5 years). That leaves £22,875 (£30,500 / 34 years x 25.5 years). The first £11,100 of that will be tax free so you are left with a net taxable gain of £11,775.
There are two rates of CGT for residential property, 18% and 28%. The rate or combination of rates that you will pay will be dependent on the level of your income in 2016/17. Assuming that your income is no more than £31,225 per annum pre-tax, you will pay CGT at 18% on £11,775 (£2,119.50). If all the net taxable gain was taxable at 28%, the CGT would be £3,297.00). Ultimately, your CGT liability should be lower than either £2,119.50 or £3,297.00 since your cost will be higher than £10,000 as I described above.
I hope this helps but let me know if you have any further questions.
I can't email it I'm afraid.
What you can do is to cut and paste the answer into an email addressed to yourself. Alternatively, you can save the question web page address into an email addressed to yourself so that you can revist the page as often as you need to. The question will remain open as long as you need it to.