The aircraft will be a 757-200, last year Thomsonfly part based a 767-200 during the summer but this year with one or two less this summer these are based else where mainly Birmingham, Mancherter and Glasgow.
As for parking this usually mainly depends if there is space at the gates on arrival and pending on their slot they will park at the air bridge if not then on a stand where you will be bussed to the terminal.
Hope this helps,
Aidoair