I need a replacement cap urgently, does anyone know wheee I could order one and have delivery by 8/8/25? 

Welcome John,

Main dealer sounds a logical choice, where you order it one day and it’s usually there for collection the next day. 
If you want cheaper, then factors such as Parts in Motion ( there are many more) should be worth a try - usually standard 48hr. delivery.

Regards,

Gareth. 

Now getting close to your deadline. How are you getting on with sorting it John? 

Update John?
Can see you have recently returned to the forum.

Hello John,

Its now 2 days over your deadline, and strangely it seems you have revisited the forum on a number of occasions, but not attempted to post an update or acknowledgement which could be of benefit to share with other members who might find themselves in a similar situation to yours at some time. 
Wondering if you would be kind enough to do that please-? 
Regards,

Gareth.