Hi and welcome to The Silver Forum.
This forum is probably one of the best places to acquire precious metals at lowest prices. Look through the UK & EU trade section https://thesilverforum.com/forum/13-uk-europe/ and you'll probably spot quite a few good deals. Additionally, if you're looking for something specific you can always post in the same forum with the details of what you are looking for.
I would say it's one of the cheapest and safest options out there to purchase precious metals as long as you do your due diligence (check user feedback, make sure sale topics have photos as per rules etc).
Alternatively, you can always purchase through group orders from the European Union https://thesilverforum.com/topic/28551-european-mint-group-orders-are-back-for-2020/ where you can get very good VAT free prices on Silver.
All the best,