Option 1 is a really good idea. I think you might need to consider increasing your hourly rate though - I'm not sure how viable it is at £10 an hour. You'd have to factor in insurance costs (public liability as well as motor); mileage expenses; travel time; ongoing training and certification as required; advertising/leaflets etc; any equipment or materials you'd be expected to supply (e.g. disposable aprons and gloves?); plus an element to represent paid holiday for yourself (being self employed it's not like you have an annual paid leave entitlement from an employer but I would suggest you use the official percentage of 12.07% of your desired hourly pay rate).
E.g. The living wage is about to go up to £7.50/hr. Self employed are not 'entitled' to it but let's say you want to be earning at least £1/hr above that as you have to find your own clients so you carry more financial risk than if you were employed - therefore you'd expect to be better recompensed.
So you're aiming to earn £8.50/hr. Say for an hour's visit you estimate 15 minutes travel time so that's another £2.12. Multiply out by the holiday accrual number so you can afford to take time off
£8.50 + £2.12 = £10.62
x 1.1207 = £11.90
You'd need to add on mileage to cover the cost of using your car - say for example
5 miles @ 45p/mile = £2.25
Then you might find that all your overheads such as insurance, training, equipment etc mean you have to add an extra £1.50 per visit.
£11.90 + £2.25 + £1.50 = £15.65
Now these are just illustrative numbers and you'll have to do your own calculations but I would be very careful that you don't end up financially much worse off doing this than you would be if you stayed employed. You'll also be responsible for keeping records, doing admin, filing tax returns etc (you might want to pay someone to do this) - so be very wary of charging as low as £10/hr. Bear in mind also that the government's target for the living wage is £9/hr by 2020 so people in employment should see their earnings rise, and presumably you'd want to keep up with that.
I wouldn't recommend the franchise route. Some of them can be good, but they suck up an awful lot of your money, making it harder to run a profitable business, and you don't always get value for money. In this sector, I wouldn't say there's a franchise brand that is well enough known to justify franchise fees.
Good luck with it if you do decide to go ahead! Tap into all the advice you can get locally from any enterprise schemes / council / library / job centre etc - or ask them for signposting to such services.