I'm in Surrey and have just found a brilliant lady to have the devil dog occasionally. She charges £12 for a whole day, 8 - 6. She takes her out walking twice, lets devil dog run around the garden with the other dogs and feeds her. Devil dog comes home knackered! Marvellous!
I work four mornings and placed an advert locally, we found a lovely retired lady who looks after him at her house with her own little dog and though she doesnt walk him, she does have a large garden so he plays out in that.
The only time he ever pulls on his lead is when we are walking up her path
I'm South West - my two go to daycare once a week (£33 for both of them, picked up and dropped off, about a 7 hour day for them). The same people also do dog walks at £8 per dog for a private walk or £6 per dog for group walks (up to 4 dogs). That's an hour of walking, so as tabulahrasa said nearer 2 hours with the collection / drop off time.
In Berkshire a half hour walk for one dog is about £8/9 - I think it is more for two dogs though not double - sometimes my dog walker just comes to walk mine round the block for 10 mins or so and I pay a fiver for that. Bargain.
I'm in West Lothian - the only one I know the price of is £9, for about an hour's walk...but by the time you add in collecting them and getting them settled back in the house it's closer to 2 hours of company.