I regret that the cream is not a licensed product in the UK and you will not be able to purchase it.
The active ingredient is available in prescription products for injection into the penis, or as an insert directly applied to the urethra. These were available before viagra etc and for many people offered successful management of their ED. However you would need a prescription to obtain them.
is there anywhere you could suggest I could buy it
I would not suggest that you purchase on the internet, as there is no guarantee that the product would be sent, nor indeed that it would not be confiscated at customs. If you have found that oral methods are not helping then you should ask for referral to a urologist.