Pete and others,
For clarity, would you think about separating your clues and the blank letter spaces like this, so that each clue starts on a new line and the reader can see how many spaces there are between the letters?
14a. 7 letters. Dressing down in sort of cloth top. R - - - o - f.
18a. 2 Words. 3.3. Spa feature perhaps too much in activity centre. - - - t - -.
15d. 9 Letters. length of cloth used in fitting attachment on aircraft.
- - - - e - - - -.
25a. 2 Words. 5.4. religious leader from a west african country a boy repelled.
- - - - i - - - a.