Normally a hot month - loads of plants die when you take a holiday - or simply take it easy. You can normally get decent sized bedding plant replacements at this time of year - at a reasonable price.
Dead-head roses, annuals, perennials - for a prolonged flowering period
Keep watering them, and feeding with liquid fertilizer.
Remove side flower buds from Dahlias and Chrysanthemums
Water and keep feeding hanging baskets/tubs daily
Get to the garden centre before all of the choice Daffodils etc sell out
Last trim of hedges - especially beech, if you want to keep the winter foliage.
Sow some spring cabbage
Dry off your shallots and onions as the tops brown
Pinch out the tops of runner beans - it will increase the yield!
Pinch out the tops of tomato plants - remove lower leaves (In greenhouse)
Tayberries and loganberries can be increased by 'layering'
Summer prune your wisteria - this encourages flower spurs for next year
Look hard at your garden - does any area need to be re-planned?
If your Brussels Sprouts get top heavy, earth them up a little bit!
Watch out for birds eating your fruit crops - and do something about it.
Alpines can be propagated by cutting now - and seed; as soon as it is ripe
Most shrubs and climbers will benefit from a dressing of Sulphate of Potash now.
Get some more barbecue-ing in. It will soon be autumn!
Bet you can't wait until September, so that you can take it easy!