Please read before I get the obligatory replies branding me as the spawn of satan etc 
I have been borrowing my sisters car for the last week or so due to my own car having a heap of problems of it's own. I have (or at least I was under the impression I had) been driving this under my entitlement to drive other cars third party. The wording on my insurance certificate is along the lines of 'The policy holder may drive other cars not belonging to him/her and not hired to him under a hire purchase agreement' with no further mention of checking my policy docs etc. Because my insurance company is 'green' they don't post me a policy schedule instead they simply email a link to an online PDF file....which upon further reading states the other car must have insurance in it's own right in order for mine third party cover to be valid. I'm sure you can see where this is going...
On my way back to work after lunch today I broke down in lane one of a dual carriageway and I tried to limp it to the parking bay but ended up stopping about fifty yards short. As I was blocking a busy road I phoned 999 and the police came and closed lane one whilst we pushed the car off the road. As a par for the course they ran the usual checks and they speak to my insurance company who advise of this technicality. As a result, despite being very helpful / sincere the police have to carry out their obligations and seize the vehicle and issue me with an fpn for £200 and six points.
Now I know that I am in the wrong here and yes I should have checked the policy document/phoned the insurance company perhaps but obviously we all make mistakes and the police agree that it's pretty harsh that it doesn't mention this requirement on my insurance certificate itself. I'm simply looking for some advice from anyone who may have had experience with this in the past or have any knowledge of previous case law.
I'm not disputing the black and white facts but querying is it worth me taking this to court due to the genuine belief/mitigating circs that I was insured alongside the wording on my certificate and that I called it in myself (i.e. I wouldn't have phoned 999 if I blatently knew I wasn't insured), have previously been of good character (no crim record, no points) or should I simply take the 6 points and £200 fine?
Your thoughts please - thanks in advance

I have been borrowing my sisters car for the last week or so due to my own car having a heap of problems of it's own. I have (or at least I was under the impression I had) been driving this under my entitlement to drive other cars third party. The wording on my insurance certificate is along the lines of 'The policy holder may drive other cars not belonging to him/her and not hired to him under a hire purchase agreement' with no further mention of checking my policy docs etc. Because my insurance company is 'green' they don't post me a policy schedule instead they simply email a link to an online PDF file....which upon further reading states the other car must have insurance in it's own right in order for mine third party cover to be valid. I'm sure you can see where this is going...
On my way back to work after lunch today I broke down in lane one of a dual carriageway and I tried to limp it to the parking bay but ended up stopping about fifty yards short. As I was blocking a busy road I phoned 999 and the police came and closed lane one whilst we pushed the car off the road. As a par for the course they ran the usual checks and they speak to my insurance company who advise of this technicality. As a result, despite being very helpful / sincere the police have to carry out their obligations and seize the vehicle and issue me with an fpn for £200 and six points.
Now I know that I am in the wrong here and yes I should have checked the policy document/phoned the insurance company perhaps but obviously we all make mistakes and the police agree that it's pretty harsh that it doesn't mention this requirement on my insurance certificate itself. I'm simply looking for some advice from anyone who may have had experience with this in the past or have any knowledge of previous case law.
I'm not disputing the black and white facts but querying is it worth me taking this to court due to the genuine belief/mitigating circs that I was insured alongside the wording on my certificate and that I called it in myself (i.e. I wouldn't have phoned 999 if I blatently knew I wasn't insured), have previously been of good character (no crim record, no points) or should I simply take the 6 points and £200 fine?
Your thoughts please - thanks in advance