And there lies the problem, we first time buyers fall into this trap. Next year we all be shopping around 3 weeks before and hopefully saving some money
From personal experience (see post here), I would recommend starting to get quotes as early as possible. My best quote so far was at -28 days (-21 days significantly higher).
... I'll keep checking each week however, just in case there is another 'sweet spot' between now and my 17th June collection day!