Rental income: allowable expenses (box 29) related to travel

I have rental properties in the UK and now live in the EU.
In box 29 (Other allowable expenses) one can claim travel expenses when visiting one's property (45p/mile when travelling by car).
Since I live outside the Uk, can I claim as expenses also the plane ticket (in fact quite cheap as it is Ryanair) and/or train travel and overnight accomadation expenses?
Thanks

Hi
Unfortunately, we are unable to provide specific advice tailored to individual circumstances on this forum. This forum is for general queries only and is intended to help you self-serve. 
If your trip is wholly and exclusively for the purpose of the rental property business and no personal aspect is carried out, i.e. to see a concert, for a vacation etc, then flight and train expenses would be classed as allowable expenses. 
Overnight accommodation is also an allowable expense as they would be classed as required to conduct business matters. 
See guidance at: PIM2220 - Deductions: main types of expense: travelling expenses - HMRC internal manual  and Claim tax relief for your job expenses: Travel and overnight expenses. 
Customers with more complex enquiries often engage the services of a professional advisor or accountant and this may be something you wish to consider.
Thank you