Before you contact the insurance because once you have they log it against you anyway as a no claim accident give this fella on ebay a ring.
http://www.ebay.co.uk/sch/eurosmartd...53.m2749.l2654
Looks like at the moment he doesn't have your bumper in stock but he may be able to get it for you.
I got a painted bumper for my daughters fiesta for £170 and a local garage fitted it for £50 you could probably fit it yourself. The excess would have cost her £250 so it saved money and the insurance cant sting her for the next five years.
The bumper was a really good quality well painted with a couple of small bottles of paint and laquer to match for any stone chips. The paint match was brilliant and 2 years on still looks great.