Thanks everyone. We will be travelling down to Manchester from Cumbria by car. We will both have a bike with us for the course which runs sat and sun so we thought we would have an overnighter away from the kids

We have never been to the NCC so weren't sure whether we could park there and stay somewhere further out or were better close by. Will have to sit down and read some reviews I think.
just to remind, you will not be allowed your bikes on the tram, your best bet as you're driving is to drive to the velodrome from wherever you stop - I'm guessing you're bringing track bikes so not wanting to put the tyres down on tarmac so distance is less of a hurdle. Within 10 miles or so of the NCC you can be into some nice quiet countryside and the nicer quiet little village B&Bs / pubs.
Or for cheap & convenient there is a
travelodge about 3 miles away just on the right side of Ashton under Lyne at the junction of Lord Sheldon Way & the A635 Manchester Road (which splits onto the A662 which goes right to the NCC door). It is also bang on the Ashton junction (23) of the M60 so you'd be straight off the motorway to booking in within a matter of moments.
The Travelodge is just that, a bland generic place to go to sleep, the Pub/restaurant next door The Sheldon Arms is a pleasant place to spend an evening, friendly staff, decent food and booze, comfy surroundings. On the downside, theres nowhere to go if you fancy stretching your legs.
The NCC has recently improved the car park a bit, although it is still quite small, but there is a very large Asda next door with plenty of parking space and they only seem to object to football fans.