Hi Gary, and welcome to the Forum.
Your query over the suitability for use in Spain ,of Electrical equipment purchased within the UK is an important question to be raised.
Historically the answers given would have varied from 'Yes' to 'Maybe' through to a definate 'No' .
In recent decades Eoropean countries have succesfully harmonized their Electrical Generation and Distribution systems to Residential, Commercial and Industrial customers ,which has enabled safe Electrical product 'interchangabilty ' of use by users within those countries, this in turn, lessening restrictions of trade by allowing Manufacturers to produce Electrical Equipment to the one agreed Standard that can be sold, without technical restriction, in many countries.
Alongside this, a general Conformity and Testing Standard was agreed and put in place .
This Standard mark is based on a French phrase of "Conformite Europeene", which literally means " European Conformity". All products tested as being of a Safe standard for use within European countries ,including E.U and Non E.U Members states, will carry the "CE" mark.
It cannot be stressed any more strongly to say if you do not see this "CE" mark on Electrical Equipment then Do Not purchase it and definately Do Not use it.
As an additional Consumer safeguard it has, within The UK, in recent years become Mandatory for all Portable Electrical equipment used within the workplace and places used by the general Public to be regularly Inspected and Tested to ensure it's safety in continued use. Some may recognise this in practice by the more common term of " PAT Testing .
It wouldn't be a bad idea for Householders to have their Electrical Appliances periodically Tested for continued safety, however, at present , in The UK, it is only Landord owned properties who are, by Law, required to abide by it.
On the issue subsequently raised and discussed here ,concerning UK to Spanish converter " Travel Adapters" , Its recommended useage is clearly defined within the first part of its name I.e. "Travel " .
These items are allowed to be produced for short term use ,as described by their Manufacturers, they are also only reliably safe for Electrical equipment of "low power useage", typically taken as part of holiday luggage ,although some hair dryers and similar heat producing items may not be suitable for use via these "adaptors".
Travel Adaptor overheating, Fires and, or Electic shocks can and have been, the result of "Travel Adaptors" of poor design and construction as as a direct result of being used outside the Manufacturers recommendations.
To aid the consumer through this confusing ,and potentially unsafe situation, a British Standard for "Travel Adaptors" has ,within the past few years, been introduced . B.S. 8546.
This new Standard, c/w its familiar and trusted "Kitemark" sign, goes far beyond the "CE" testing requirements relating to "Travel Adaptors" . Included within its markings are the products' capabilities in terms of mode of use, plus its maximum recommend Power Loading capabilities ,I.e Voltage, Current and Wattage.
Indication is also given as to whether it is suitable for earthed or non earthed appliances which is a major, often overlooked, safety issue with some types of Travel Adaptors used outside the UK .
I would certainly recommend any appliances with UK 13amp plugs used 'Long term", outside the UK and within Spain and its Territories, to be converted by retrofitting with a 'good quality' Spanish "F" type "3 pin" 'Schuko' plug.
Hope that advice helps others. Gary, best wishes to you on your eventually move.
LeckyLes