Another question guys.... What expenses can us windies claim that we might be missing out? I have a friend who had an accountant and they seem to claim for everything..just making sure my book keeper is claiming everything they can. Equipment,vehicle costs diesel, etc etc. my friend was even going on about taking cash out as a business and an allowance and all that. No idea what he is on about. What could I claim next tax year I may have forgotten? Like I said small fry earner but if u could save a few hundred quid each year. I work off trolley/backpack van is cheap to run. Would there be any point leasing a brand new van for example? Lots of questions but any expenses I may have missed would be great guys 
It really depends on how you work, but there are more obscure things that have gone through my accounts over the years - though totally legitimately:
Crowbar. I carry one around with me because, at some jobs, I lean over the side gate on a stepladder and need it to reach and unhook the bolt. It's the only use I put it to.
Sunglasses. Since switching to WFP, I need to look up more. This can be uncomfortable or even dangerous without proper sunglasses.
Detergent - although not using much with WFP, a very few windows and some inside cleaning requires it still.
Costs for washing work clothes and cleaning cloths.
Electricity/heating for doing accounts - moreso if you put a room aside especially for this.
Stationery.
Phone (proportion?).
Battery charger.
Assortment of small tools such as screwdrivers/scissors/sharp knife/hammer/bradawl etc. I have used all of these in maintaining WFP at some point.
Minor bits and bobs like jubilee clips/glue/tape/water and electrical connectors.
Some of the things that involve home use/ washing clothes etc. may fall under a reasonable "fixed cost" for simplification. I used to keep receipts for (proportions of) washing powder, washing machine repairs etc. but I'm told this is no longer necessary.
Things that others might claim for:
Spouse's "wages" if she doesn't already earn her full tax-free allowance.
Banking charges.