@kurseong Judging by the address, the Authorities would intercept and confiscate sims at the reception facility.
Unless you have contrary information?
A £10 top up, gives credit for use on a paygo basis.
As long as you have roaming enabled on your profile EU/EEA roaming (RLAH) is automatic and without hassle for a minimum of 14 days and a potential 63 days in any 120 day window.
Your RLAH eligibility relies primarily on UK residence to take advantage of goodybag allowances, without a goodybag you pay standard UK pay as you go rates 15p/min 5p MB for data and 5p a text.
With an active goodybag after eligible use, your supplement is 3.2p/min 1p text and data 0.046p MB (around £4.60 GB)