Thanks for your question - I am Sam and I am one of the UK tax experts here on Just Answer
Yes there will be a capital gain arising as you are selling a property that ceased to be your main residence more than 18 month ago and the fact you plan to purcahse a new property has no bearing as this is not a business.
However as you have lived abroad since 2006? then under the old residency rules you would have remained free of UK capital gains due to having achieved a period of non residency for more than 5 full tax years. However, residency rules changed from 06/04/2015 and any sales of UK properties made by non resident individuals see the gain that arises from 06/04/2015 to the date of sale as being liable in the UK - I enclose the information in the link as to hwo you should proceed once the sale is complete (and of course note with this new purchase, any future sale will give rise to the full capital gain being considered in the UK)
And this link advises how to make that calculation
Do let me know if I can assist further
Thanks for your response and further questions
It will be the latter gain that is considered (so the gain made just from April 2015 to sale) as the gain that arises from you leaving the UK until 05/04/2015 will be preserved under the old residency rules.
So yes the variations are real and correct as one looks at the situation had you been UK resident throughout and the other looks at the changes of legislation and how that affects you - which is merely the gain made from 06/04/2015 to estimated date and value of sale - so your gain is set to be £1500 estimated
There are no capital gains exemptions or reliefs beyond the annual exemption allowance of £11,100 (so you will have NIL capital gains to pay based on your estimated position)
Yes if the property is jointly held then each of you share the gain arising and each of you have the £11,100 exemption (so with a gain of estimated £1500 - thats £750 each - less the annual exemption allowance (due for each of you) so NIL capital gains to pay
No you cannot use personal allowances against a capital gain just the annual exemption allowance as indicated above
To get an accurate value pre April 2015 - two local estate agents or the district valuer - link here for them (but HMRC would accept 2 x local estate agents post period) https://www.gov.uk/government/organisations/district-valuer-services-dvs
Finally through out affiliation with Just Answer, we cannot take on clients met through this service directly - but if you are seeking just information and guidance to mange matters yourself - then do come back to Just Answer and you can always ask for me