If your DH/DP is a member of a professional body like RUSI or IET in my DHs case, you can claim back part of the costs of these subscriptions through HMRC. Just stick 'em on your Tax Return, and they'll adjust the notice of coding for you.
If you are renting out your house as you are overseas, get your rent paid gross by filling in a non-resident landlord declaration, and it should be tax free. Try to ensure that your mortgage interest is greater than the rent received, and the rent is then tax free, and put everything you can against the rent; costs from letting agents; any maintenance you do on the property - last year I had mine redecorated just after I moved overseas, that counted; the electrical test and subsequent work counted, as did maintenance of the boiler, replacing windows etc. I made a paper loss of around £5,000, which is then carried forward and set against this years liability which will be a loss again, so we should never have to pay tax on the rent.
If you jointly own the property, then you have to each declare any income from rent on an annual tax return, but only the 50% that applies to you. The only way that the non-earner can get the total rent as income is to change the proportion of the property that they own, which involves solicitors and expense.
I'm not a tax officer, but somehow, having worked for the Revenue for a year when I was 19, I have ended up doing all the tax stuff for DH for the past 23 years...plus the fact that it's paperwork, and he hates that, which is why he never claimed for all that mileage!