If you want to fake entries in your log-book, that's your choice. The chances are the CAA won't look twice, unless they have reason to.
But if they do have reason to, they will. They can check your log-book against logs for the aircraft, or against booking-in sheets at airfields, or against ATC recordings..... and if they discover that you've been faking entries, I wouldn't like to be in your shoes!
The next question is why would you want to fake 12 hours every two years? The fact is, if this is all you've flown, you're not going to be safe anyway, and you'll need to spend some time with an instructor getting up to speed. I wouldn't like to share the skies with anyone who flies so few hours that they need to fake entries to maintain currency... let alone anyone who would actually have so little respect for the rules that they would actually do it.
FFF
-------------