The 2 front tyres have roughly 5.5mm if tread remaining but the rears will need replaced due to wear on the inside edge.
2 wheels are unmarked, 1 has 1 kerb mark and the last has a few bits. No cracks, welds or buckles on any of them.
£300. Happy to wrap for courier and assist with arranging if needs be. To give you an idea, a set of wheels is circa £48 via senditnow.com (Parcelforce).