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Been looking at tents & not sure what hydrostatic head mean  the one I looked is 4000 is this any good for a weekend break ?

a quick google reveals the techno blurb

"Rain resistance is measured as a hydrostatic head in millimetres (mm). This indicates the pressure of water needed to penetrate a fabric. Heavy or wind-driven rain has a higher pressure than light rain. Standing on a groundsheet increases the pressure on any water underneath. Fabric with a hydrostatic head of 1000 mm or less is best regarded as shower resistant, with 1500 mm being usually suitable for summer camping. Tents for year-round use generally have at least 2000 mm; expedition tents intended for extreme conditions are often rated at 3000 mm. Where quoted, groundsheets may be 5000 mm or more."

As long as the tent is more than about 1500 or 2000 HH you should be ok.

Tents usually leak through the seams, not through the fabric, so the rain resistance is only as good as the seam sealing.