Blimey, I admire your optimism in trying to reseed an edge to the lawn - its more usual to cut out the damaged area, reverse the turfs you've removed so the intact edge is at the edge, and then reseed the now bare batch that will be showing away from the edge.

As for whether to seed now, sure, give it a go, if it doesn't take you can always reseed in spring, but it does look rather as if some heavy rain will wash the seed down into the planting bed.

Hi, I don't think I would bother reseeding the area, why not try cultivating the area, and plant some spring flowering bulbs, or small perennials, then if you don't like the look you can reseed later, Derek.

Amsterdam: Yes, go ahead and reseed your lawn. Now is the perfect time to do it; you won't have to worry about those pesky weeds rooting in and spoiling your nice new lawn - the're not in season. Here is a website that explains exactly how & when to do it. You don't have to buy Scotts, but the technique is apropos. See the video.

How & When to Reseed Lawn Grass

https://www.scotts.com/en-us/library/grass-grass-seed/how-when-reseed-lawn-grass

'Fall is the best time to overseed a lawn or repair thin or bare areas. The cool nights and mild, shorter days provide the ideal conditions for seed germination. Seed is better able to retain moisture in these conditions, and seedlings will thrive without the extreme heat that occurs in the summer months.'

https://www.thespruce.com/fall-lawn-overseeding-2152905

My first thought was what a nice opportunity to plant some primroses there for spring colour, and think about
reseeding afterwards if you still want to.
Good time for sowing lawn seed is generally reckoned to be April in the UK, especially considering how very wet its been lately.

You can plant grass seed in the Spring, but if you're asking for 'the very best time to plant grass seed,' it's Autumn for reasons already explained.

'If you want a fantastic lawn, but don’t want the expense of buying turf, try creating it from seed. Grass seed is best sown from late summer to mid-autumn; there is less competition from weeds, and the soil is warm, and damp from rain. Perfect for seeds to germinate.

If you miss the opportunity to sow in autumn, try in mid-spring, but only if you can give the new grass plenty of water. Don’t attempt to sow in summer - it’s unlikely you’ll be able to give the lawn enough water to prevent it from shrivelling up and dying.

http://www.bbc.co.uk/gardening/basics/techniques/lawns_sowlawn1.shtml

I wouldn't bother with grass seeding, the hedge will grow again and the same scenario will happen. Extend the bed and live with it a while, you can add suitable plants later, just neaten up for now.

if you do go ahead and sow seed chose a variety for shady areas. more likely to thrive than a general grass seed.

remember we are due for a lot of rain next week as tropical storm Ophelia strikes.

Thank you all for your replies. Kinda liking the idea of planting some pretty primroses until next year. Mmmm.... will have to have a think. Am intending in future for the hedge to kept in check more so it won't create these dead patches of grass.

My hardy geraniums always hang over the lawn edges and after I cut them back I get dead patches too but the grass seems to recover with no help from me.