Get an accountant to answer this for you, that way you have some back up if there are any issues.
SkyDreamer1, you can offset the cost against your income so if you paid out £30000 for example in 1 year, you would be seen to have spent £30000 on a business outgoing so your taxable earnings would be less therefore you would save on your tax, how much will depend on your income.
Example:
Earnings PAYE £350000
Type rating £30000
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Taxable earnings £5000 so that would be under the £10000ish tax free allowance, so no tax due that year.
Lets say you didn't offset the type rating, so you would be taxed on £35000 which would mean 20% tax on everything above the £10000ish allowance.
If you earned above that then you get into the 40%/50% tax bracket, so offsetting the training cost becomes very worthwhile.
I'm going on my knowledge from running a limited company here so the info above should not be trusted or considered as advice, as I say, go to your accountant for reliable information you can be comfortable with.