With all due respect to those who get a kick out of Delamere…
It isn’t 15-20 minutes drive from the Op. Without any traffic (never happens) it is 30 minutes away from Lymm, so 40 minutes away from Alty. For the sake of 10 minutes extra driving, go the other way towards the peaks.
There is no elevation at Delamere… You’ll be lucky to hit 1,000 feet after several hours riding.
Having said that, it all comes down to what you are after – if pootling round a forest track, looping similar areas, with some ‘hidden’ sections that don’t necessarily link together is what you want, then Delamere works – just getting out there on a bike and riding I guess. Clearly that does give some people a kick.
As also mentioned you can go and do a trail centre like Degla which is great if you want a big bmx track experience… That’s more on the hour mark in the Wrexham area. If you want something natural over there, jib off the trail centre and throw in things like mast descent.
If you want endless trails, where you can just keep on going, big climbs, big descents, loamy woods (i.e. ladybower Narnia), rocky tech fests and amazing views – head in the direction of the peaks. There’s treats before you get there (several referenced in this thread – Mellor cross/berms, hobson moor, etherow, alphin pike) which are easily in reach under an hour if you want them… also it gets better and better the further you go in.