Anything smaller than full-size will be out-grown by the age of 9 or 10
Squier Fender Strat
Squier Fender Telecaster
Chord Electric Guitar
Encore Electric Guitar
Most of these are available in a range of colours
The nearest shops are Wisbech Music Centre and Roadhouse Music (in Boston) and definitely worth a visit and mention my name for a deal. Both shops are really helpful and if you have any issues you can pop back to the shop though i can usually assist with most issues/strings/set-up/etc. This will also give you the chance to check out and play the instruments and get a better idea of what is is you are buying.
Road House music (Boston, Lincs) wisbech Music Centre (Cambs)
Yamaha Pacifica (as used during the lessons) Excellent guitar! Yamaha Pacifica 012 II JET Guitars JS-300 (great guitar for the price!)
Obviously, spending more will get you a better instrument but any of those should be ideal first-time guitars. Could also buy just the guitar (most above are packages with amp* + guitar) which will get the pupil going for now then perhaps let Santa bring an amp for christmas?) *amp being short for "amplifier"
Andertons music shop Gear4music shop DV247 (music store) PMT music shop
After playing for a year or more, the player will start to know what it is they like about a particular guitar, whether that be the shape, the sound or the feel, besides the aesthetics. This will certainly infulence future choices.
Yamaha ERG 121 GPII Gigmaker Starterpackage
DV247
Gear4Music
Only choose full-size, not 3/4 sized guitars