If we look at the direct combat elements of the fleets, excluding spain's amphibious landing ships as seen is defending, and both side's research vessels, minesweepers/ mine countermeasure ships and the fast patrol boats
I will list displacement as well
>Spen: (3 attack submarines (4 replacements expected),1 aircraft carrier, 12 frigates, 8 patrol)
110,629 tonne displacement+8,800 tonne submarine replacements expected
>3 Galerna Class Submarines (1,760 tonnes)
>(have 4 S-80 class (2,200 tonne) Submarines scheduled)
>1 Juan carlos amphibious Assault ship (27,079 tonnes)
functions as an aircraft carrier
>6 Alvaro Class Destroyer (5,800-6,400 tonnes)
>6 Santa Maria Class Frigates (4,000 tonnes)
>5 Meteoro Class Offshore Patrol Vessels (2,670 tonnes)
>3 Descubierta Class Patrol Vessel (1,640 tonnes)
>Bongistan: 4 strategic submarines, 7 attack submarines, 19 frigates, 4 patrol,1 helicopter carrier, 1 aircraft carrier+1 expected, 2 amphibious docks
250,600 tonne displacement+ 39,120 amphibious docks + 141,200 aircraft carriers
>4 Vanguard Class Submarines (15,900 tonnes)
>3 Astute Class Submarines (7,400 tonnes)
>4 Trafalgar Class Submarines (5,300 tonnes)
>(Scheduled for 2020- 2 Elizabeth Class Aircraft >Carriers (70,600 tonnes)- 1 is built already but undergoing trials, next is close to completion)
>HMS Ocean (21,500 tonnes)-helicopter carrier
>Albion Class (19,560 tonnes)-amphibious transport dock
>6 Daring Class Frigates (8,500 tonnes)
>13 Duke Class Frigates (4,900 tonnes)
>4 River Class Patrol Vessels (1,700-2,000)
as we can see the Royal navy has an advantage