I think I know the very basics of CG tax on second homes, IE it's 40% of any profit. I'm also aware that some expenditure on said property can be deducted from the sale value in order to reduce the CG bill, but what sort of costs can be attributed? Is it strictly repairs/renovations or can service charges/letting agent fees/buildings insurance costs/mortgage interest(!) and things like that be included? And whatever the answer to that questions is, do you then have to provide receipts for every penny you're trying to reduce the CG bill by?

The process behind all these questions is basically an attempt at working out an accurate figure of what we may or may not get if we sell our flat...

Thanks in advance for any help