Hi, I am looking to get a rear parking sensor kit for my '04 hippo.

So far, I've found the LR part number VUB502420 and the BEST price is (drum roll)....

£470.29 inc vat and delivery. :doh:
(Britpart & Rimmerbros)
Edit: No luck with Paddocks/Craddocks/Duckworth

Do you think the cost is so high as maybe they aren't made anymore?

God help me if my parents try and park without them! So I must get them asap.

If anyone knows a better price, please let me and everyone else know!
Thanks.

Try buying a set of after market sensors and fit them bout £50 last time I looked

Depending on your DIY ability:

4 Sensor Wired Reversing Kit - Free Delivery : In-Car Reversing Kits : Maplin

or numerous alternatives from Amazon