Thats impossible...
Even for el-Dobonio..
the 'new' breakfast there (about 2-3 years on the menu) is top for lardo-loading. Bacon eggs, sausage, beans, chips, tomato and a slice of fried spam for £3.. (no tea included unlike the regualr brekky). I recon the £5 challenge is possible if you start with a bacon and suasage roll (1.25) follwed by a regular breakfast (£3) and sponge pudding and custard (75p). The killer is the two slices of bread and butter that come with the breakfast... Just when you think youve made it...