The quick answer is don't buy it, it's too much money and it's not a great car.
If you are set on an Escort for some odd reason don't buy it if you are expecting the GTi badge to mean it's a hot hatch, it isn't. The Escort GTi is just a rebadged Si with exactly the same engine, suspension and brakes. It's not a complete slug, but it barely qualifies as a "warm hatch". However, according to Parkers it's a group 13 car, yet the Si is only 10.
It would be easier to explain why the escort is worse!
The mondeo is a better car in every conceivable way, more comfortable, better equipped, better built, better value for money, just better. For your same £1400, you'd get full leather (electric and heated most likely), climate control, cruise control, electric everything, etc etc etc.
Yes, you'll end up with a 2.0 4-pot, and a larger car, but they aren't any more to insure (generally) than smaller engined small hatches, simply because less young people wrap them into lamposts.
I'm going to add something from experience here.
Firstly the Escort GTI is a badly named car, it isn't a GTI in performance terms at all.
But my girlfriend now owns the GTI my Brother-In-Law bought new and it has been a good car tbh.
They do come as std with 115 bhp, I have fitted a filter and Magnex exhaust to the car and it has been RR'd twice at 138bhp! Admittedly I am very fussy with maintenance. There have been no major problems outwith normal servicing except for it needed a new fuel tank last year and I can see it needing a clutch soon as the release bearing has begun to get noisey (now on 97k and original clutch).
Anyway, I like it, not a bad looking car and if you think they were £14k IIRC when new it's not a bad deal.
But IMO a 1.8 Focus would be a better car, the GTI carries a high insurance due to the badge it doesn't live up to. Fuel consumption is fine- mid 30's easily. A mk2 Mondeo is a bargain, so much kit for the money and probably is better built, but does have the image of an older owner. (I have owned one - an ST200)
It's your money, if you like it, buy it!