We are not hiring a car as i cant drive and my partner drives for a living so wants a rest. We wont be able to afford 7 nights disney and 7 night onsite universal as coming from the uk this is very expensive
Based off that, I might recommend rather than staying onsite at Disney, You can do a larger portion of your stay (week and 1/2 maybe) 'offsite' at one of the few less expensive properties that offer decent Disney Transportation within the arches. I see others have already mentioned them, but I'll recap. You may want to compare the rates you can get at each option to see what would best fit into your budget. Unfortunately, I don't know if any of these hotels offer airport transportation, but you are likely going to need to arrange transportation to the hotel from the airport on your own.
Downtown Disney Hotels - Several of them to choose from, and they are situated right outside Downtown Disney. i believe the shuttle service to the Disney Parks is better than most offsite locations, and the Downtown Disney Hilton i believe also gives you access to EMH at the parks. It's an easy walk from these hotels to either DTD or the Crossroads shopping center area which will have several decent places to eat.
Swan/Dolphin - Most people consider them Disney onsite since they get direct access to traditional Disney TRansportation (not sure about Magic Express), and are situated next to the Boardwalk and Yacht/Beach club. They however are not operated by Disney, so are usually less expensive than comparable onsite Disney hotels with higher quality accommodations.
Bonnet Creek Area (Inside the arches next door to the Caribbean Beach Resort/ POP/ AOA, but technically offsite) :
Hilton/Waldorf Astoria - I hear good things about these 2 hotels. There is a thread here about them which you can get more details about them. From what I understand, they have a pretty good shuttle service to the parks, and the hotels themselves are quite nice.
Wyndham Grand Orlando @ Bonnet Creek - A nice traditional hotel that shares it's location and amenities with the neighboring Timeshare property. It has a nice shuttle service to the parks, but also a daily resort fee above your quoted rates.
Wyndham Bonnet Creek Resort - The Timeshare property. This is not a traditional hotel, so some things like daily maid service aren't included. It does have a good park shuttle service you can use. Since it's a timeshare resort, rates can vary since you'll be renting from owners and not the resort directly. There are several which people on the DIS have had good experiences with [checkout the I Looooove Bonnet Creek thread for more info]. A couple nice things about staying at the timeshare resort vs. a hotel for your trip are that the unit has a washer/dryer located inside your room. With a 2 week stay, that means you can do some laundry during your stay so you don't have to pack as much... or take time out of your vacation experience to sit in a hotel laundrymat. The unit/condo also has a kitchen in it. Depending on your budget and vacation style, This can come in handy since you can use a service like Garden Grocer to deliver some groceries to you at the resort and then eat in your room occasionally cheaper than you could if you were to eat out. [Even if you just eat breakfast before you leave for the day, over 2 weeks the savings from eating n the room vs. out can add up]. I've also found that it's nice having the ability to refrigerate and store, and then reheat later, leftovers I may have from other meals I've had while on vacation.
FWIW, i don't believe any of these options have regular shuttle service to Universal or Seaworld, but you can always utilize a taxi or shared shuttle service to the other parks, or if your budget allows due to the Disney stay savings, relocate to someplace closer to those parks at the end of your stay.