Strictly, you should have registered as self-employed within three months of the end of the month in which you started out as such. There is a penalty of £100 which used to be levied on anybody who registered as self-employed late but this will only now normally be charged if an individual owes tax and/or national insurance contributions. Based on the figures you have given me, that won't be the case as your income is covered by the personal allowance for 2013/14 of £9,440. There are some notes on penalties here
As your period of self-employment was a one-off, you will probably only need to complete one tax return so it may be worth calling the tax office on the number here
, explaining your situation and asking them if you should formally register as self-employed even though, as of now, you are no longer self-employed. I had a friend who had a short period of self-employment and the tax office let them provide the income and expenses information in a letter. If you are told to register as self-employed, then you can do that online here
. It's a fairly straightforward process but let me know if you have any problems. The criteria for a tax return submission are here
If you do have to register as self-employed, you can if you wish complete your tax return online and you can register to do that here
once you have your UTR (Universal Tax Reference). The deadlines for submission of the tax return can be found here
As far as expenses are concerned, if you were working in a fixed location, your travel costs are not a tax deductible expense I'm afraid. Take a look here
for the types of expenses you can claim.
I hope this helps but let me know if you have nay further questions.