It is a well-known fact that some sites do their best to prevent automated price monitoring performed by Price2Spy and similar tools. Ocado.com is one of these sites, putting in a lot of effort in banning such traffic.
After we have exhausted all classic ban-avoiding techniques, we have resorted to our strongest weapon – Stealth IP traffic.
(Why do we turn to Stealth IP only as a last resort? The reason is simple – this type of IP traffic is very expensive and may cause additional costs for clients who are monitoring many URLs on such sites. That is why we keep trying conventional IP methods till we feel we have exhausted all available possibilities – and that’s when we turn to Stealth IP traffic.)