I personally am not one for PCP's, or other credit schemes; these are generally in favour of the finance firms who earn money via the interest / APR (a £6k bike can cost you more like £7k on finance, so it pays to check).
If you go to a bank, and ask for a loan, you may just find the interest on that is more competitive than on PCP. Plus, if you can pay outright on the bike (OK, you'll still have to pay back the bank), you can probably haggle a few hundred quid off the price. If you can save a bit, the loan doesn't need to be so big then.
When I bought mine I'd saved up enough (took a bit of time right enough, lots of overtime, and sacrificed weekends in the pub), and got £500 off paying outright (bike advertised at £4k, paid £3500, 3.5 year old), plus on a 3yo bike, I missed the hard-hitting depreciation too. Also meant that when I was made redundant, I didn't have to keep finding the money to keep up payments because it was already paid for.