Hi Robbob,
Thanks for your prompt and helpful comments. I have read and understood your comments but would like some clarification on a couple of points.
1. As my husband receives a taxable pension, and is now doing unpaid work for our business, I wondered whether becoming self employed but incurring a business loss would be deductible from the tax liability on his pension, thereby giving him some tax benefit. I know that rental losses can only be carried forward to set against rental income liability in future tax years, and cannot be offset against current pension or earned income (such as a loss from self employment could be). Is this correct?
2. The capital gains liability issue is also still niggling me. Payment to tradesmen for labour when refurbishing the property is an allowable charge against capital gains because it is a demonstrable cost, but if he improves the value of the property through his own labour there is no monetary value attached, and therefore a larger capital gain is made. I understand that only the actual costs incurred can be claimed, but this is where I thought it may be of benefit to be able to put a value on his time, and invoice the rental business as a self employed tradesman. He would then obviously have to declare this as income from self employment, but could this not have a double benefit of reducing the capital gains tax liability, and perhaps also reduce income tax liability as in point 1 above?
If all the above is nonsense

and there is no benefit to be gained, it seems from your reply that we could simply charge the tools and equipment etc to the property business. Would this be treated as capital expenditure or be allowable revenue expense?
Many thanks for your help
Magsmum