I claim mileage (and keep receipts as additional proof). The heating / office argument is another vague allowance, as you need to spend x amount of hours in the office for business use (which at present for me hasn't been much due to it being very limited as I subbie and don't do any work outside of this).
Does anyone have any advice from an accountant they use for daily subsistence (i.e. food bought whilst away from home / accommodation whilst staying with friends / family etc)? If so, what allowances and mileage have you been quoted?
I have done my accounts for many years and was lucky enough to have had a career in business management for a plc. The best way for you to think of this topic is to first determine I the item you are looking to offset against tax is wholly used for the support of the business, if so keep receipts.
There are a few anomalies but I still stick to that principle.
1. Training - this may or may not be claimable - HMRC give good guidance
2. Food - By nature our activities mean we have to buy food from a shop wherever we are working, this is an expense. HMRC again give guidance and I use a specific number for non-receipted food per day, but if I am working very long hours this increases with receipts.
3. Accommodation: Hotels used for training or staying away (provided the training is allowable) is claimable, staying with friends, personally I don't claim
4. Car / van - I use a private car, claim HMRC mileage rates, log miles and claim back the VAT off the fuel, very simple to operate
5. If its a proper van then this can be a company vehicle and as such , fuel, MOT, insurance, tax , maintenance are direct business expenses
6. Logo clothing, PPE and tools are expenses
7. Mobile phone is in name of business, website, internet etc etc is all for business, family use their own.
8. Running a Ltd co from home means I can claim back some expenses but I err on the side of caution here
9. Washing workwear, I don't bother claiming
Lastly, although HMRC appear to set traps wrt fines and the like, you can easily setup email alerts for key dates and they do publish more quidelines than you could read in a lifetime, lol
I use an accounting piece of software and DIY mainly because I can and it means I can take a snapshot of the business at anytime and get a good idea when to pay myself a dividend. I also do my own PAYE for 2 employees, again once you are setup its not hard and again HMRC are very very helpful if you cannot fathom some of their systems