I'm pretty sure I heard a GSW at Chester the other week, (near the Cassowary pen) but tbh I hear them on a daily basis so didn't think much of it. The sharp slow 'tack, tack, tack' from overhead as it makes it's undulating flight between tall trees is quite unmistakable.
As a birder I'd be quite surprised if a Lesser Spotted was at Chester Zoo, being quite a shy bird, small as a sparrow, and as already mentioned, more fond of the canopy. While I wouldn't say there could
never be one there it would be out of it's 'comfort zone' for the species. Perhaps in previous years when there was more tree cover and the species was more abundant it may explain the record.
It also has a more southerly distribution, although I have seen them as far north as the Trough of Bowland some 15 years ago. LSW is getting almost 'twitchable' in it's scarcity these days sadly.
The Greater Spotted is the most common woodpecker in the UK, and as such the most likely to be seen in a place like Chester Zoo, where the trees established enough to hold their food preference are sparce (compared to closed canopy) but within their comfort zone to reach.
*cough* Sorry, I'll go out of Birdforum mode now
Personally I became a little distracted watching a Kestrel fly over while Andrew was talking about the Magpies and Jungle Fowl before entering the elephant house.
