Just sow your grass seed when it warms up for a longer spell of warmth - its only warm in the sun in fact going cooler over the weekend - rain on Tuesday -I've already got that Miracle Gro so I don't need the Home Bargains do I ..
If I am doing that first though, does it mean I have to wait until the end of Summer to plant grass seed so it doesn't kill it.
Right weed & feed you lawn first end of April - let it work apply when the gras & weeds are 2 inches high leave fro 8-10 days to let the weed killer work - water in well if its a dry spell or ideally put it on if rain is forecast ...
When it works you will find holes gaps in your lawn where the weed has died - remember grass seed will not germinate on rock hard solid on your lawn so fork any big areas & rake a tilth - Then ideally get a garden trug with compost & put big hand fulls of grass seed in it Home bargain have the cheapest lawn seed etc mix well & and over sow you bare areas with a your mixture of seed & compost { stops the birds from getting your seed} use an abundance of grass seed in your mix - then over sow with more seed & lightly rake in water immediately with a fin spray until soaked & germination should take 7-10 days -
When you cut your grass avoid the newly sown germinated grass with your mower the first cut - then only cut it the next time around - do not feed your lawn with miracle grow use that to feed plants or hanging baskets etc .... - wasting money if it looks starved add a spring fertilise Slow release feed - this IMO is not needed as you have already used weed & feed before resowing ....
Remember the more you feed you lawn the more you will have to cut it - In last years drought I cut mine about 4 times in one season ,,,,,



