Any advice to source some 700c wheels that have 126mm rear dropout spacing

I started cycling a couple of years ago after I purchased a gravel bike (cannondale topstone 4). I don’t know much about bikes and want to learn so I’ve decided to build a vintage road bike. I’m starting with a Claud Butler Velox S Reynolds 531 Frame. My dad has all the tools and I think it’d be a good project to learn lots about bikes. However I’ve quickly realised that unless I want to cold set the frame, I’ll need to find some 700c wheels with 126mm spacing.

Firstly, does anyone have any thoughts on the frame I’ve purchased? And secondly, does anybody have any pointers on sourcing the wheels. I’ve scoured eBay but found that most are in the US and with shipping come to about £300 which is way above my budget.

Any advice at all is much appreciated.