I was always under the impression that an accused person does not have to say anything once accused of an offence, and cannot be forced to supply a statement. That was what the basis of what the caution when arrested was all about, 'you are not obliged to say anything etc etc'
The law in the UK is, the prosecution has to prove your guilt, you do not have to prove your innocence, so be careful what you say.
Of course saying nothing may be seen to imply guilt, but do not feel pressured to say somthing that may be misconstrued.
Perhaps some of our 'professional ' legal fliers can advise you on this.